---
_id: '1531'
abstract:
- lang: eng
  text: The Heat Kernel Signature (HKS) is a scalar quantity which is derived from
    the heat kernel of a given shape. Due to its robustness, isometry invariance,
    and multiscale nature, it has been successfully applied in many geometric applications.
    From a more general point of view, the HKS can be considered as a descriptor of
    the metric of a Riemannian manifold. Given a symmetric positive definite tensor
    field we may interpret it as the metric of some Riemannian manifold and thereby
    apply the HKS to visualize and analyze the given tensor data. In this paper, we
    propose a generalization of this approach that enables the treatment of indefinite
    tensor fields, like the stress tensor, by interpreting them as a generator of
    a positive definite tensor field. To investigate the usefulness of this approach
    we consider the stress tensor from the two-point-load model example and from a
    mechanical work piece.
alternative_title:
- Mathematics and Visualization
article_processing_charge: No
author:
- first_name: Valentin
  full_name: Zobel, Valentin
  last_name: Zobel
- first_name: Jan
  full_name: Reininghaus, Jan
  id: 4505473A-F248-11E8-B48F-1D18A9856A87
  last_name: Reininghaus
- first_name: Ingrid
  full_name: Hotz, Ingrid
  last_name: Hotz
citation:
  ama: 'Zobel V, Reininghaus J, Hotz I. Visualizing symmetric indefinite 2D tensor
    fields using The Heat Kernel Signature. In: Hotz I, Schultz T, eds. <i>Visualization
    and Processing of Higher Order Descriptors for Multi-Valued Data</i>. Vol 40.
    1st ed. Springer; 2015:257-267. doi:<a href="https://doi.org/10.1007/978-3-319-15090-1_13">10.1007/978-3-319-15090-1_13</a>'
  apa: Zobel, V., Reininghaus, J., &#38; Hotz, I. (2015). Visualizing symmetric indefinite
    2D tensor fields using The Heat Kernel Signature. In I. Hotz &#38; T. Schultz
    (Eds.), <i>Visualization and Processing of Higher Order Descriptors for Multi-Valued
    Data</i> (1st ed., Vol. 40, pp. 257–267). Springer. <a href="https://doi.org/10.1007/978-3-319-15090-1_13">https://doi.org/10.1007/978-3-319-15090-1_13</a>
  chicago: Zobel, Valentin, Jan Reininghaus, and Ingrid Hotz. “Visualizing Symmetric
    Indefinite 2D Tensor Fields Using The Heat Kernel Signature.” In <i>Visualization
    and Processing of Higher Order Descriptors for Multi-Valued Data</i>, edited by
    Ingrid Hotz and Thomas Schultz, 1st ed., 40:257–67. Springer, 2015. <a href="https://doi.org/10.1007/978-3-319-15090-1_13">https://doi.org/10.1007/978-3-319-15090-1_13</a>.
  ieee: V. Zobel, J. Reininghaus, and I. Hotz, “Visualizing symmetric indefinite 2D
    tensor fields using The Heat Kernel Signature,” in <i>Visualization and Processing
    of Higher Order Descriptors for Multi-Valued Data</i>, 1st ed., vol. 40, I. Hotz
    and T. Schultz, Eds. Springer, 2015, pp. 257–267.
  ista: 'Zobel V, Reininghaus J, Hotz I. 2015.Visualizing symmetric indefinite 2D
    tensor fields using The Heat Kernel Signature. In: Visualization and Processing
    of Higher Order Descriptors for Multi-Valued Data. Mathematics and Visualization,
    vol. 40, 257–267.'
  mla: Zobel, Valentin, et al. “Visualizing Symmetric Indefinite 2D Tensor Fields
    Using The Heat Kernel Signature.” <i>Visualization and Processing of Higher Order
    Descriptors for Multi-Valued Data</i>, edited by Ingrid Hotz and Thomas Schultz,
    1st ed., vol. 40, Springer, 2015, pp. 257–67, doi:<a href="https://doi.org/10.1007/978-3-319-15090-1_13">10.1007/978-3-319-15090-1_13</a>.
  short: V. Zobel, J. Reininghaus, I. Hotz, in:, I. Hotz, T. Schultz (Eds.), Visualization
    and Processing of Higher Order Descriptors for Multi-Valued Data, 1st ed., Springer,
    2015, pp. 257–267.
date_created: 2018-12-11T11:52:33Z
date_published: 2015-01-01T00:00:00Z
date_updated: 2022-06-10T09:50:14Z
day: '01'
department:
- _id: HeEd
doi: 10.1007/978-3-319-15090-1_13
edition: '1'
editor:
- first_name: Ingrid
  full_name: Hotz, Ingrid
  last_name: Hotz
- first_name: Thomas
  full_name: Schultz, Thomas
  last_name: Schultz
intvolume: '        40'
language:
- iso: eng
month: '01'
oa_version: None
page: 257 - 267
publication: Visualization and Processing of Higher Order Descriptors for Multi-Valued
  Data
publication_identifier:
  isbn:
  - 978-3-319-15089-5
publication_status: published
publisher: Springer
publist_id: '5640'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Visualizing symmetric indefinite 2D tensor fields using The Heat Kernel Signature
type: book_chapter
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 40
year: '2015'
...
---
_id: '1563'
abstract:
- lang: eng
  text: For a given self-map $f$ of $M$, a closed smooth connected and simply-connected
    manifold of dimension $m\geq 4$, we provide an algorithm for estimating the values
    of the topological invariant $D^m_r[f]$, which equals the minimal number of $r$-periodic
    points in the smooth homotopy class of $f$. Our results are based on the combinatorial
    scheme for computing $D^m_r[f]$ introduced by G. Graff and J. Jezierski [J. Fixed
    Point Theory Appl. 13 (2013), 63-84]. An open-source implementation of the algorithm
    programmed in C++ is publicly available at {\tt http://www.pawelpilarczyk.com/combtop/}.
author:
- first_name: Grzegorz
  full_name: Graff, Grzegorz
  last_name: Graff
- first_name: Pawel
  full_name: Pilarczyk, Pawel
  id: 3768D56A-F248-11E8-B48F-1D18A9856A87
  last_name: Pilarczyk
citation:
  ama: Graff G, Pilarczyk P. An algorithmic approach to estimating the minimal number
    of periodic points for smooth self-maps of simply-connected manifolds. <i>Topological
    Methods in Nonlinear Analysis</i>. 2015;45(1):273-286. doi:<a href="https://doi.org/10.12775/TMNA.2015.014">10.12775/TMNA.2015.014</a>
  apa: Graff, G., &#38; Pilarczyk, P. (2015). An algorithmic approach to estimating
    the minimal number of periodic points for smooth self-maps of simply-connected
    manifolds. <i>Topological Methods in Nonlinear Analysis</i>. Juliusz Schauder
    Center for Nonlinear Studies. <a href="https://doi.org/10.12775/TMNA.2015.014">https://doi.org/10.12775/TMNA.2015.014</a>
  chicago: Graff, Grzegorz, and Pawel Pilarczyk. “An Algorithmic Approach to Estimating
    the Minimal Number of Periodic Points for Smooth Self-Maps of Simply-Connected
    Manifolds.” <i>Topological Methods in Nonlinear Analysis</i>. Juliusz Schauder
    Center for Nonlinear Studies, 2015. <a href="https://doi.org/10.12775/TMNA.2015.014">https://doi.org/10.12775/TMNA.2015.014</a>.
  ieee: G. Graff and P. Pilarczyk, “An algorithmic approach to estimating the minimal
    number of periodic points for smooth self-maps of simply-connected manifolds,”
    <i>Topological Methods in Nonlinear Analysis</i>, vol. 45, no. 1. Juliusz Schauder
    Center for Nonlinear Studies, pp. 273–286, 2015.
  ista: Graff G, Pilarczyk P. 2015. An algorithmic approach to estimating the minimal
    number of periodic points for smooth self-maps of simply-connected manifolds.
    Topological Methods in Nonlinear Analysis. 45(1), 273–286.
  mla: Graff, Grzegorz, and Pawel Pilarczyk. “An Algorithmic Approach to Estimating
    the Minimal Number of Periodic Points for Smooth Self-Maps of Simply-Connected
    Manifolds.” <i>Topological Methods in Nonlinear Analysis</i>, vol. 45, no. 1,
    Juliusz Schauder Center for Nonlinear Studies, 2015, pp. 273–86, doi:<a href="https://doi.org/10.12775/TMNA.2015.014">10.12775/TMNA.2015.014</a>.
  short: G. Graff, P. Pilarczyk, Topological Methods in Nonlinear Analysis 45 (2015)
    273–286.
date_created: 2018-12-11T11:52:44Z
date_published: 2015-03-01T00:00:00Z
date_updated: 2021-01-12T06:51:37Z
day: '01'
department:
- _id: HeEd
doi: 10.12775/TMNA.2015.014
intvolume: '        45'
issue: '1'
language:
- iso: eng
month: '03'
oa_version: None
page: 273 - 286
publication: Topological Methods in Nonlinear Analysis
publication_status: published
publisher: Juliusz Schauder Center for Nonlinear Studies
publist_id: '5608'
quality_controlled: '1'
scopus_import: 1
status: public
title: An algorithmic approach to estimating the minimal number of periodic points
  for smooth self-maps of simply-connected manifolds
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 45
year: '2015'
...
---
_id: '1567'
abstract:
- lang: eng
  text: My personal journey to the fascinating world of geometric forms started more
    than 30 years ago with the invention of alpha shapes in the plane. It took about
    10 years before we generalized the concept to higher dimensions, we produced working
    software with a graphics interface for the three-dimensional case. At the same
    time, we added homology to the computations. Needless to say that this foreshadowed
    the inception of persistent homology, because it suggested the study of filtrations
    to capture the scale of a shape or data set. Importantly, this method has fast
    algorithms. The arguably most useful result on persistent homology is the stability
    of its diagrams under perturbations.
alternative_title:
- LNCS
article_processing_charge: No
author:
- first_name: Herbert
  full_name: Edelsbrunner, Herbert
  id: 3FB178DA-F248-11E8-B48F-1D18A9856A87
  last_name: Edelsbrunner
  orcid: 0000-0002-9823-6833
citation:
  ama: 'Edelsbrunner H. Shape, homology, persistence, and stability. In: <i>23rd International
    Symposium</i>. Vol 9411. Springer Nature; 2015.'
  apa: 'Edelsbrunner, H. (2015). Shape, homology, persistence, and stability. In <i>23rd
    International Symposium</i> (Vol. 9411). Los Angeles, CA, United States: Springer
    Nature.'
  chicago: Edelsbrunner, Herbert. “Shape, Homology, Persistence, and Stability.” In
    <i>23rd International Symposium</i>, Vol. 9411. Springer Nature, 2015.
  ieee: H. Edelsbrunner, “Shape, homology, persistence, and stability,” in <i>23rd
    International Symposium</i>, Los Angeles, CA, United States, 2015, vol. 9411.
  ista: 'Edelsbrunner H. 2015. Shape, homology, persistence, and stability. 23rd International
    Symposium. GD: Graph Drawing and Network Visualization, LNCS, vol. 9411.'
  mla: Edelsbrunner, Herbert. “Shape, Homology, Persistence, and Stability.” <i>23rd
    International Symposium</i>, vol. 9411, Springer Nature, 2015.
  short: H. Edelsbrunner, in:, 23rd International Symposium, Springer Nature, 2015.
conference:
  end_date: 2015-09-26
  location: Los Angeles, CA, United States
  name: 'GD: Graph Drawing and Network Visualization'
  start_date: 2015-09-24
date_created: 2018-12-11T11:52:46Z
date_published: 2015-01-01T00:00:00Z
date_updated: 2022-01-28T08:25:00Z
day: '01'
department:
- _id: HeEd
intvolume: '      9411'
language:
- iso: eng
month: '01'
oa_version: None
publication: 23rd International Symposium
publication_status: published
publisher: Springer Nature
publist_id: '5604'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Shape, homology, persistence, and stability
type: conference
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 9411
year: '2015'
...
---
_id: '1568'
abstract:
- lang: eng
  text: Aiming at the automatic diagnosis of tumors from narrow band imaging (NBI)
    magnifying endoscopy (ME) images of the stomach, we combine methods from image
    processing, computational topology, and machine learning to classify patterns
    into normal, tubular, vessel. Training the algorithm on a small number of images
    of each type, we achieve a high rate of correct classifications. The analysis
    of the learning algorithm reveals that a handful of geometric and topological
    features are responsible for the overwhelming majority of decisions.
acknowledgement: This research is supported by the project No. 477 of P.G. Demidov
  Yaroslavl State University within State Assignment for Research.
article_processing_charge: No
author:
- first_name: Olga
  full_name: Dunaeva, Olga
  last_name: Dunaeva
- first_name: Herbert
  full_name: Edelsbrunner, Herbert
  id: 3FB178DA-F248-11E8-B48F-1D18A9856A87
  last_name: Edelsbrunner
  orcid: 0000-0002-9823-6833
- first_name: Anton
  full_name: Lukyanov, Anton
  last_name: Lukyanov
- first_name: Michael
  full_name: Machin, Michael
  last_name: Machin
- first_name: Daria
  full_name: Malkova, Daria
  last_name: Malkova
citation:
  ama: 'Dunaeva O, Edelsbrunner H, Lukyanov A, Machin M, Malkova D. The classification
    of endoscopy images with persistent homology. In: <i>Proceedings - 16th International
    Symposium on Symbolic and Numeric Algorithms for Scientific Computing</i>. IEEE;
    2015:7034731. doi:<a href="https://doi.org/10.1109/SYNASC.2014.81">10.1109/SYNASC.2014.81</a>'
  apa: 'Dunaeva, O., Edelsbrunner, H., Lukyanov, A., Machin, M., &#38; Malkova, D.
    (2015). The classification of endoscopy images with persistent homology. In <i>Proceedings
    - 16th International Symposium on Symbolic and Numeric Algorithms for Scientific
    Computing</i> (p. 7034731). Timisoara, Romania: IEEE. <a href="https://doi.org/10.1109/SYNASC.2014.81">https://doi.org/10.1109/SYNASC.2014.81</a>'
  chicago: Dunaeva, Olga, Herbert Edelsbrunner, Anton Lukyanov, Michael Machin, and
    Daria Malkova. “The Classification of Endoscopy Images with Persistent Homology.”
    In <i>Proceedings - 16th International Symposium on Symbolic and Numeric Algorithms
    for Scientific Computing</i>, 7034731. IEEE, 2015. <a href="https://doi.org/10.1109/SYNASC.2014.81">https://doi.org/10.1109/SYNASC.2014.81</a>.
  ieee: O. Dunaeva, H. Edelsbrunner, A. Lukyanov, M. Machin, and D. Malkova, “The
    classification of endoscopy images with persistent homology,” in <i>Proceedings
    - 16th International Symposium on Symbolic and Numeric Algorithms for Scientific
    Computing</i>, Timisoara, Romania, 2015, p. 7034731.
  ista: 'Dunaeva O, Edelsbrunner H, Lukyanov A, Machin M, Malkova D. 2015. The classification
    of endoscopy images with persistent homology. Proceedings - 16th International
    Symposium on Symbolic and Numeric Algorithms for Scientific Computing. SYNASC:
    Symbolic and Numeric Algorithms for Scientific Computing, 7034731.'
  mla: Dunaeva, Olga, et al. “The Classification of Endoscopy Images with Persistent
    Homology.” <i>Proceedings - 16th International Symposium on Symbolic and Numeric
    Algorithms for Scientific Computing</i>, IEEE, 2015, p. 7034731, doi:<a href="https://doi.org/10.1109/SYNASC.2014.81">10.1109/SYNASC.2014.81</a>.
  short: O. Dunaeva, H. Edelsbrunner, A. Lukyanov, M. Machin, D. Malkova, in:, Proceedings
    - 16th International Symposium on Symbolic and Numeric Algorithms for Scientific
    Computing, IEEE, 2015, p. 7034731.
conference:
  end_date: 2014-09-25
  location: Timisoara, Romania
  name: 'SYNASC: Symbolic and Numeric Algorithms for Scientific Computing'
  start_date: 2014-09-22
date_created: 2018-12-11T11:52:46Z
date_published: 2015-02-05T00:00:00Z
date_updated: 2025-09-23T13:44:17Z
day: '05'
department:
- _id: HeEd
doi: 10.1109/SYNASC.2014.81
external_id:
  isi:
  - '000366596600074'
isi: 1
language:
- iso: eng
month: '02'
oa_version: None
page: '7034731'
publication: Proceedings - 16th International Symposium on Symbolic and Numeric Algorithms
  for Scientific Computing
publication_status: published
publisher: IEEE
publist_id: '5603'
quality_controlled: '1'
related_material:
  record:
  - id: '1289'
    relation: later_version
    status: public
scopus_import: '1'
status: public
title: The classification of endoscopy images with persistent homology
type: conference
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
year: '2015'
...
---
_id: '1578'
abstract:
- lang: eng
  text: We prove that the dual of the digital Voronoi diagram constructed by flooding
    the plane from the data points gives a geometrically and topologically correct
    dual triangulation. This provides the proof of correctness for recently developed
    GPU algorithms that outperform traditional CPU algorithms for constructing two-dimensional
    Delaunay triangulations.
acknowledgement: "The research of the second author is partially supported by NSF
  under grant DBI-0820624 and by DARPA under grants HR011-05-1-0057 and HR0011-09-006\r\n"
article_processing_charge: No
author:
- first_name: Thanhtung
  full_name: Cao, Thanhtung
  last_name: Cao
- first_name: Herbert
  full_name: Edelsbrunner, Herbert
  id: 3FB178DA-F248-11E8-B48F-1D18A9856A87
  last_name: Edelsbrunner
  orcid: 0000-0002-9823-6833
- first_name: Tiowseng
  full_name: Tan, Tiowseng
  last_name: Tan
citation:
  ama: Cao T, Edelsbrunner H, Tan T. Triangulations from topologically correct digital
    Voronoi diagrams. <i>Computational Geometry</i>. 2015;48(7):507-519. doi:<a href="https://doi.org/10.1016/j.comgeo.2015.04.001">10.1016/j.comgeo.2015.04.001</a>
  apa: Cao, T., Edelsbrunner, H., &#38; Tan, T. (2015). Triangulations from topologically
    correct digital Voronoi diagrams. <i>Computational Geometry</i>. Elsevier. <a
    href="https://doi.org/10.1016/j.comgeo.2015.04.001">https://doi.org/10.1016/j.comgeo.2015.04.001</a>
  chicago: Cao, Thanhtung, Herbert Edelsbrunner, and Tiowseng Tan. “Triangulations
    from Topologically Correct Digital Voronoi Diagrams.” <i>Computational Geometry</i>.
    Elsevier, 2015. <a href="https://doi.org/10.1016/j.comgeo.2015.04.001">https://doi.org/10.1016/j.comgeo.2015.04.001</a>.
  ieee: T. Cao, H. Edelsbrunner, and T. Tan, “Triangulations from topologically correct
    digital Voronoi diagrams,” <i>Computational Geometry</i>, vol. 48, no. 7. Elsevier,
    pp. 507–519, 2015.
  ista: Cao T, Edelsbrunner H, Tan T. 2015. Triangulations from topologically correct
    digital Voronoi diagrams. Computational Geometry. 48(7), 507–519.
  mla: Cao, Thanhtung, et al. “Triangulations from Topologically Correct Digital Voronoi
    Diagrams.” <i>Computational Geometry</i>, vol. 48, no. 7, Elsevier, 2015, pp.
    507–19, doi:<a href="https://doi.org/10.1016/j.comgeo.2015.04.001">10.1016/j.comgeo.2015.04.001</a>.
  short: T. Cao, H. Edelsbrunner, T. Tan, Computational Geometry 48 (2015) 507–519.
date_created: 2018-12-11T11:52:49Z
date_published: 2015-08-01T00:00:00Z
date_updated: 2025-09-29T10:58:50Z
day: '01'
department:
- _id: HeEd
doi: 10.1016/j.comgeo.2015.04.001
external_id:
  isi:
  - '000355887700001'
intvolume: '        48'
isi: 1
issue: '7'
language:
- iso: eng
month: '08'
oa_version: None
page: 507 - 519
publication: Computational Geometry
publication_status: published
publisher: Elsevier
publist_id: '5593'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Triangulations from topologically correct digital Voronoi diagrams
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 48
year: '2015'
...
---
_id: '1582'
abstract:
- lang: eng
  text: We investigate weighted straight skeletons from a geometric, graph-theoretical,
    and combinatorial point of view. We start with a thorough definition and shed
    light on some ambiguity issues in the procedural definition. We investigate the
    geometry, combinatorics, and topology of faces and the roof model, and we discuss
    in which cases a weighted straight skeleton is connected. Finally, we show that
    the weighted straight skeleton of even a simple polygon may be non-planar and
    may contain cycles, and we discuss under which restrictions on the weights and/or
    the input polygon the weighted straight skeleton still behaves similar to its
    unweighted counterpart. In particular, we obtain a non-procedural description
    and a linear-time construction algorithm for the straight skeleton of strictly
    convex polygons with arbitrary weights.
article_processing_charge: No
author:
- first_name: Therese
  full_name: Biedl, Therese
  last_name: Biedl
- first_name: Martin
  full_name: Held, Martin
  last_name: Held
- first_name: Stefan
  full_name: Huber, Stefan
  id: 4700A070-F248-11E8-B48F-1D18A9856A87
  last_name: Huber
  orcid: 0000-0002-8871-5814
- first_name: Dominik
  full_name: Kaaser, Dominik
  last_name: Kaaser
- first_name: Peter
  full_name: Palfrader, Peter
  last_name: Palfrader
citation:
  ama: 'Biedl T, Held M, Huber S, Kaaser D, Palfrader P. Weighted straight skeletons
    in the plane. <i>Computational Geometry: Theory and Applications</i>. 2015;48(2):120-133.
    doi:<a href="https://doi.org/10.1016/j.comgeo.2014.08.006">10.1016/j.comgeo.2014.08.006</a>'
  apa: 'Biedl, T., Held, M., Huber, S., Kaaser, D., &#38; Palfrader, P. (2015). Weighted
    straight skeletons in the plane. <i>Computational Geometry: Theory and Applications</i>.
    Elsevier. <a href="https://doi.org/10.1016/j.comgeo.2014.08.006">https://doi.org/10.1016/j.comgeo.2014.08.006</a>'
  chicago: 'Biedl, Therese, Martin Held, Stefan Huber, Dominik Kaaser, and Peter Palfrader.
    “Weighted Straight Skeletons in the Plane.” <i>Computational Geometry: Theory
    and Applications</i>. Elsevier, 2015. <a href="https://doi.org/10.1016/j.comgeo.2014.08.006">https://doi.org/10.1016/j.comgeo.2014.08.006</a>.'
  ieee: 'T. Biedl, M. Held, S. Huber, D. Kaaser, and P. Palfrader, “Weighted straight
    skeletons in the plane,” <i>Computational Geometry: Theory and Applications</i>,
    vol. 48, no. 2. Elsevier, pp. 120–133, 2015.'
  ista: 'Biedl T, Held M, Huber S, Kaaser D, Palfrader P. 2015. Weighted straight
    skeletons in the plane. Computational Geometry: Theory and Applications. 48(2),
    120–133.'
  mla: 'Biedl, Therese, et al. “Weighted Straight Skeletons in the Plane.” <i>Computational
    Geometry: Theory and Applications</i>, vol. 48, no. 2, Elsevier, 2015, pp. 120–33,
    doi:<a href="https://doi.org/10.1016/j.comgeo.2014.08.006">10.1016/j.comgeo.2014.08.006</a>.'
  short: 'T. Biedl, M. Held, S. Huber, D. Kaaser, P. Palfrader, Computational Geometry:
    Theory and Applications 48 (2015) 120–133.'
date_created: 2018-12-11T11:52:51Z
date_published: 2015-02-01T00:00:00Z
date_updated: 2025-09-29T11:06:26Z
day: '01'
ddc:
- '000'
department:
- _id: HeEd
doi: 10.1016/j.comgeo.2014.08.006
external_id:
  isi:
  - '000345056700007'
file:
- access_level: open_access
  checksum: c1ef67f6ec925e12f73a96b8fe285ab4
  content_type: application/pdf
  creator: system
  date_created: 2018-12-12T10:16:28Z
  date_updated: 2020-07-14T12:45:02Z
  file_id: '5215'
  file_name: IST-2016-474-v1+1_1-s2.0-S0925772114000807-main.pdf
  file_size: 505987
  relation: main_file
file_date_updated: 2020-07-14T12:45:02Z
has_accepted_license: '1'
intvolume: '        48'
isi: 1
issue: '2'
language:
- iso: eng
month: '02'
oa: 1
oa_version: Published Version
page: 120 - 133
publication: 'Computational Geometry: Theory and Applications'
publication_status: published
publisher: Elsevier
publist_id: '5589'
pubrep_id: '474'
quality_controlled: '1'
related_material:
  record:
  - id: '1584'
    relation: other
    status: public
scopus_import: '1'
status: public
title: Weighted straight skeletons in the plane
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 48
year: '2015'
...
---
_id: '1583'
abstract:
- lang: eng
  text: We study the characteristics of straight skeletons of monotone polygonal chains
    and use them to devise an algorithm for computing positively weighted straight
    skeletons of monotone polygons. Our algorithm runs in O(nlogn) time and O(n) space,
    where n denotes the number of vertices of the polygon.
article_processing_charge: No
author:
- first_name: Therese
  full_name: Biedl, Therese
  last_name: Biedl
- first_name: Martin
  full_name: Held, Martin
  last_name: Held
- first_name: Stefan
  full_name: Huber, Stefan
  id: 4700A070-F248-11E8-B48F-1D18A9856A87
  last_name: Huber
  orcid: 0000-0002-8871-5814
- first_name: Dominik
  full_name: Kaaser, Dominik
  last_name: Kaaser
- first_name: Peter
  full_name: Palfrader, Peter
  last_name: Palfrader
citation:
  ama: Biedl T, Held M, Huber S, Kaaser D, Palfrader P. A simple algorithm for computing
    positively weighted straight skeletons of monotone polygons. <i>Information Processing
    Letters</i>. 2015;115(2):243-247. doi:<a href="https://doi.org/10.1016/j.ipl.2014.09.021">10.1016/j.ipl.2014.09.021</a>
  apa: Biedl, T., Held, M., Huber, S., Kaaser, D., &#38; Palfrader, P. (2015). A simple
    algorithm for computing positively weighted straight skeletons of monotone polygons.
    <i>Information Processing Letters</i>. Elsevier. <a href="https://doi.org/10.1016/j.ipl.2014.09.021">https://doi.org/10.1016/j.ipl.2014.09.021</a>
  chicago: Biedl, Therese, Martin Held, Stefan Huber, Dominik Kaaser, and Peter Palfrader.
    “A Simple Algorithm for Computing Positively Weighted Straight Skeletons of Monotone
    Polygons.” <i>Information Processing Letters</i>. Elsevier, 2015. <a href="https://doi.org/10.1016/j.ipl.2014.09.021">https://doi.org/10.1016/j.ipl.2014.09.021</a>.
  ieee: T. Biedl, M. Held, S. Huber, D. Kaaser, and P. Palfrader, “A simple algorithm
    for computing positively weighted straight skeletons of monotone polygons,” <i>Information
    Processing Letters</i>, vol. 115, no. 2. Elsevier, pp. 243–247, 2015.
  ista: Biedl T, Held M, Huber S, Kaaser D, Palfrader P. 2015. A simple algorithm
    for computing positively weighted straight skeletons of monotone polygons. Information
    Processing Letters. 115(2), 243–247.
  mla: Biedl, Therese, et al. “A Simple Algorithm for Computing Positively Weighted
    Straight Skeletons of Monotone Polygons.” <i>Information Processing Letters</i>,
    vol. 115, no. 2, Elsevier, 2015, pp. 243–47, doi:<a href="https://doi.org/10.1016/j.ipl.2014.09.021">10.1016/j.ipl.2014.09.021</a>.
  short: T. Biedl, M. Held, S. Huber, D. Kaaser, P. Palfrader, Information Processing
    Letters 115 (2015) 243–247.
date_created: 2018-12-11T11:52:51Z
date_published: 2015-02-01T00:00:00Z
date_updated: 2025-09-22T14:35:14Z
day: '01'
ddc:
- '000'
department:
- _id: HeEd
doi: 10.1016/j.ipl.2014.09.021
external_id:
  isi:
  - '000346225300034'
file:
- access_level: open_access
  checksum: 2779a648610c9b5c86d0b51a62816d23
  content_type: application/pdf
  creator: system
  date_created: 2018-12-12T10:18:45Z
  date_updated: 2020-07-14T12:45:03Z
  file_id: '5367'
  file_name: IST-2016-473-v1+1_1-s2.0-S0020019014001987-main.pdf
  file_size: 270137
  relation: main_file
file_date_updated: 2020-07-14T12:45:03Z
has_accepted_license: '1'
intvolume: '       115'
isi: 1
issue: '2'
language:
- iso: eng
month: '02'
oa: 1
oa_version: Published Version
page: 243 - 247
publication: Information Processing Letters
publication_status: published
publisher: Elsevier
publist_id: '5588'
pubrep_id: '473'
quality_controlled: '1'
scopus_import: '1'
status: public
title: A simple algorithm for computing positively weighted straight skeletons of
  monotone polygons
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 115
year: '2015'
...
---
_id: '1584'
abstract:
- lang: eng
  text: We investigate weighted straight skeletons from a geometric, graph-theoretical,
    and combinatorial point of view. We start with a thorough definition and shed
    light on some ambiguity issues in the procedural definition. We investigate the
    geometry, combinatorics, and topology of faces and the roof model, and we discuss
    in which cases a weighted straight skeleton is connected. Finally, we show that
    the weighted straight skeleton of even a simple polygon may be non-planar and
    may contain cycles, and we discuss under which restrictions on the weights and/or
    the input polygon the weighted straight skeleton still behaves similar to its
    unweighted counterpart. In particular, we obtain a non-procedural description
    and a linear-time construction algorithm for the straight skeleton of strictly
    convex polygons with arbitrary weights.
article_processing_charge: No
author:
- first_name: Therese
  full_name: Biedl, Therese
  last_name: Biedl
- first_name: Martin
  full_name: Held, Martin
  last_name: Held
- first_name: Stefan
  full_name: Huber, Stefan
  id: 4700A070-F248-11E8-B48F-1D18A9856A87
  last_name: Huber
  orcid: 0000-0002-8871-5814
- first_name: Dominik
  full_name: Kaaser, Dominik
  last_name: Kaaser
- first_name: Peter
  full_name: Palfrader, Peter
  last_name: Palfrader
citation:
  ama: 'Biedl T, Held M, Huber S, Kaaser D, Palfrader P. Reprint of: Weighted straight
    skeletons in the plane. <i>Computational Geometry: Theory and Applications</i>.
    2015;48(5):429-442. doi:<a href="https://doi.org/10.1016/j.comgeo.2015.01.004">10.1016/j.comgeo.2015.01.004</a>'
  apa: 'Biedl, T., Held, M., Huber, S., Kaaser, D., &#38; Palfrader, P. (2015). Reprint
    of: Weighted straight skeletons in the plane. <i>Computational Geometry: Theory
    and Applications</i>. Elsevier. <a href="https://doi.org/10.1016/j.comgeo.2015.01.004">https://doi.org/10.1016/j.comgeo.2015.01.004</a>'
  chicago: 'Biedl, Therese, Martin Held, Stefan Huber, Dominik Kaaser, and Peter Palfrader.
    “Reprint of: Weighted Straight Skeletons in the Plane.” <i>Computational Geometry:
    Theory and Applications</i>. Elsevier, 2015. <a href="https://doi.org/10.1016/j.comgeo.2015.01.004">https://doi.org/10.1016/j.comgeo.2015.01.004</a>.'
  ieee: 'T. Biedl, M. Held, S. Huber, D. Kaaser, and P. Palfrader, “Reprint of: Weighted
    straight skeletons in the plane,” <i>Computational Geometry: Theory and Applications</i>,
    vol. 48, no. 5. Elsevier, pp. 429–442, 2015.'
  ista: 'Biedl T, Held M, Huber S, Kaaser D, Palfrader P. 2015. Reprint of: Weighted
    straight skeletons in the plane. Computational Geometry: Theory and Applications.
    48(5), 429–442.'
  mla: 'Biedl, Therese, et al. “Reprint of: Weighted Straight Skeletons in the Plane.”
    <i>Computational Geometry: Theory and Applications</i>, vol. 48, no. 5, Elsevier,
    2015, pp. 429–42, doi:<a href="https://doi.org/10.1016/j.comgeo.2015.01.004">10.1016/j.comgeo.2015.01.004</a>.'
  short: 'T. Biedl, M. Held, S. Huber, D. Kaaser, P. Palfrader, Computational Geometry:
    Theory and Applications 48 (2015) 429–442.'
date_created: 2018-12-11T11:52:51Z
date_published: 2015-07-01T00:00:00Z
date_updated: 2025-09-29T11:06:25Z
day: '01'
ddc:
- '000'
department:
- _id: HeEd
doi: 10.1016/j.comgeo.2015.01.004
external_id:
  isi:
  - '000351967400008'
file:
- access_level: open_access
  checksum: 5b33719a86f7f4c8e5dc62c1b6893f49
  content_type: application/pdf
  creator: system
  date_created: 2018-12-12T10:17:36Z
  date_updated: 2020-07-14T12:45:03Z
  file_id: '5292'
  file_name: IST-2016-475-v1+1_1-s2.0-S092577211500005X-main.pdf
  file_size: 508379
  relation: main_file
file_date_updated: 2020-07-14T12:45:03Z
has_accepted_license: '1'
intvolume: '        48'
isi: 1
issue: '5'
language:
- iso: eng
month: '07'
oa: 1
oa_version: Published Version
page: 429 - 442
publication: 'Computational Geometry: Theory and Applications'
publication_status: published
publisher: Elsevier
publist_id: '5587'
pubrep_id: '475'
quality_controlled: '1'
related_material:
  record:
  - id: '1582'
    relation: other
    status: public
scopus_import: '1'
status: public
title: 'Reprint of: Weighted straight skeletons in the plane'
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 48
year: '2015'
...
---
_id: '1590'
abstract:
- lang: eng
  text: 'The straight skeleton of a polygon is the geometric graph obtained by tracing
    the vertices during a mitered offsetting process. It is known that the straight
    skeleton of a simple polygon is a tree, and one can naturally derive directions
    on the edges of the tree from the propagation of the shrinking process. In this
    paper, we ask the reverse question: Given a tree with directed edges, can it be
    the straight skeleton of a polygon? And if so, can we find a suitable simple polygon?
    We answer these questions for all directed trees where the order of edges around
    each node is fixed.'
alternative_title:
- LNCS
article_processing_charge: No
arxiv: 1
author:
- first_name: Oswin
  full_name: Aichholzer, Oswin
  last_name: Aichholzer
- first_name: Therese
  full_name: Biedl, Therese
  last_name: Biedl
- first_name: Thomas
  full_name: Hackl, Thomas
  last_name: Hackl
- first_name: Martin
  full_name: Held, Martin
  last_name: Held
- first_name: Stefan
  full_name: Huber, Stefan
  id: 4700A070-F248-11E8-B48F-1D18A9856A87
  last_name: Huber
  orcid: 0000-0002-8871-5814
- first_name: Peter
  full_name: Palfrader, Peter
  last_name: Palfrader
- first_name: Birgit
  full_name: Vogtenhuber, Birgit
  last_name: Vogtenhuber
citation:
  ama: 'Aichholzer O, Biedl T, Hackl T, et al. Representing directed trees as straight
    skeletons. In: <i>Graph Drawing and Network Visualization</i>. Vol 9411. Springer
    Nature; 2015:335-347. doi:<a href="https://doi.org/10.1007/978-3-319-27261-0_28">10.1007/978-3-319-27261-0_28</a>'
  apa: 'Aichholzer, O., Biedl, T., Hackl, T., Held, M., Huber, S., Palfrader, P.,
    &#38; Vogtenhuber, B. (2015). Representing directed trees as straight skeletons.
    In <i>Graph Drawing and Network Visualization</i> (Vol. 9411, pp. 335–347). Los
    Angeles, CA, United States: Springer Nature. <a href="https://doi.org/10.1007/978-3-319-27261-0_28">https://doi.org/10.1007/978-3-319-27261-0_28</a>'
  chicago: Aichholzer, Oswin, Therese Biedl, Thomas Hackl, Martin Held, Stefan Huber,
    Peter Palfrader, and Birgit Vogtenhuber. “Representing Directed Trees as Straight
    Skeletons.” In <i>Graph Drawing and Network Visualization</i>, 9411:335–47. Springer
    Nature, 2015. <a href="https://doi.org/10.1007/978-3-319-27261-0_28">https://doi.org/10.1007/978-3-319-27261-0_28</a>.
  ieee: O. Aichholzer <i>et al.</i>, “Representing directed trees as straight skeletons,”
    in <i>Graph Drawing and Network Visualization</i>, vol. 9411, Springer Nature,
    2015, pp. 335–347.
  ista: 'Aichholzer O, Biedl T, Hackl T, Held M, Huber S, Palfrader P, Vogtenhuber
    B. 2015.Representing directed trees as straight skeletons. In: Graph Drawing and
    Network Visualization. LNCS, vol. 9411, 335–347.'
  mla: Aichholzer, Oswin, et al. “Representing Directed Trees as Straight Skeletons.”
    <i>Graph Drawing and Network Visualization</i>, vol. 9411, Springer Nature, 2015,
    pp. 335–47, doi:<a href="https://doi.org/10.1007/978-3-319-27261-0_28">10.1007/978-3-319-27261-0_28</a>.
  short: O. Aichholzer, T. Biedl, T. Hackl, M. Held, S. Huber, P. Palfrader, B. Vogtenhuber,
    in:, Graph Drawing and Network Visualization, Springer Nature, 2015, pp. 335–347.
conference:
  end_date: 2015-09-26
  location: Los Angeles, CA, United States
  name: 'GD: Graph Drawing and Network Visualization'
  start_date: 2015-09-24
date_created: 2018-12-11T11:52:54Z
date_published: 2015-11-27T00:00:00Z
date_updated: 2025-09-23T10:35:07Z
day: '27'
department:
- _id: HeEd
doi: 10.1007/978-3-319-27261-0_28
external_id:
  arxiv:
  - '1508.01076'
  isi:
  - '000373628600028'
intvolume: '      9411'
isi: 1
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: http://arxiv.org/abs/1508.01076
month: '11'
oa: 1
oa_version: Preprint
page: 335 - 347
publication: Graph Drawing and Network Visualization
publication_identifier:
  eisbn:
  - 978-3-319-27261-0
  isbn:
  - 978-3-319-27260-3
publication_status: published
publisher: Springer Nature
publist_id: '5581'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Representing directed trees as straight skeletons
type: book_chapter
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 9411
year: '2015'
...
---
_id: '1682'
abstract:
- lang: eng
  text: 'We study the problem of robust satisfiability of systems of nonlinear equations,
    namely, whether for a given continuous function f:K→ ℝn on a finite simplicial
    complex K and α &gt; 0, it holds that each function g: K → ℝn such that ||g -
    f || ∞ &lt; α, has a root in K. Via a reduction to the extension problem of maps
    into a sphere, we particularly show that this problem is decidable in polynomial
    time for every fixed n, assuming dimK ≤ 2n - 3. This is a substantial extension
    of previous computational applications of topological degree and related concepts
    in numerical and interval analysis. Via a reverse reduction, we prove that the
    problem is undecidable when dim K &gt; 2n - 2, where the threshold comes from
    the stable range in homotopy theory. For the lucidity of our exposition, we focus
    on the setting when f is simplexwise linear. Such functions can approximate general
    continuous functions, and thus we get approximation schemes and undecidability
    of the robust satisfiability in other possible settings.'
article_number: '26'
article_processing_charge: No
arxiv: 1
author:
- first_name: Peter
  full_name: Franek, Peter
  last_name: Franek
- first_name: Marek
  full_name: Krcál, Marek
  id: 33E21118-F248-11E8-B48F-1D18A9856A87
  last_name: Krcál
citation:
  ama: Franek P, Krcál M. Robust satisfiability of systems of equations. <i>Journal
    of the ACM</i>. 2015;62(4). doi:<a href="https://doi.org/10.1145/2751524">10.1145/2751524</a>
  apa: Franek, P., &#38; Krcál, M. (2015). Robust satisfiability of systems of equations.
    <i>Journal of the ACM</i>. ACM. <a href="https://doi.org/10.1145/2751524">https://doi.org/10.1145/2751524</a>
  chicago: Franek, Peter, and Marek Krcál. “Robust Satisfiability of Systems of Equations.”
    <i>Journal of the ACM</i>. ACM, 2015. <a href="https://doi.org/10.1145/2751524">https://doi.org/10.1145/2751524</a>.
  ieee: P. Franek and M. Krcál, “Robust satisfiability of systems of equations,” <i>Journal
    of the ACM</i>, vol. 62, no. 4. ACM, 2015.
  ista: Franek P, Krcál M. 2015. Robust satisfiability of systems of equations. Journal
    of the ACM. 62(4), 26.
  mla: Franek, Peter, and Marek Krcál. “Robust Satisfiability of Systems of Equations.”
    <i>Journal of the ACM</i>, vol. 62, no. 4, 26, ACM, 2015, doi:<a href="https://doi.org/10.1145/2751524">10.1145/2751524</a>.
  short: P. Franek, M. Krcál, Journal of the ACM 62 (2015).
corr_author: '1'
date_created: 2018-12-11T11:53:27Z
date_published: 2015-08-01T00:00:00Z
date_updated: 2025-09-23T10:38:46Z
day: '01'
department:
- _id: UlWa
- _id: HeEd
doi: 10.1145/2751524
external_id:
  arxiv:
  - '1402.0858'
  isi:
  - '000361200500001'
intvolume: '        62'
isi: 1
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: http://arxiv.org/abs/1402.0858
month: '08'
oa: 1
oa_version: Preprint
publication: Journal of the ACM
publication_status: published
publisher: ACM
publist_id: '5466'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Robust satisfiability of systems of equations
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 62
year: '2015'
...
---
_id: '1710'
abstract:
- lang: eng
  text: 'We consider the hollow on the half-plane {(x, y) : y ≤ 0} ⊂ ℝ2 defined by
    a function u : (-1, 1) → ℝ, u(x) &lt; 0, and a vertical flow of point particles
    incident on the hollow. It is assumed that u satisfies the so-called single impact
    condition (SIC): each incident particle is elastically reflected by graph(u) and
    goes away without hitting the graph of u anymore. We solve the problem: find the
    function u minimizing the force of resistance created by the flow. We show that
    the graph of the minimizer is formed by two arcs of parabolas symmetric to each
    other with respect to the y-axis. Assuming that the resistance of u ≡ 0 equals
    1, we show that the minimal resistance equals π/2 - 2arctan(1/2) ≈ 0.6435. This
    result completes the previously obtained result [SIAM J. Math. Anal., 46 (2014),
    pp. 2730-2742] stating in particular that the minimal resistance of a hollow in
    higher dimensions equals 0.5. We additionally consider a similar problem of minimal
    resistance, where the hollow in the half-space {(x1,...,xd,y) : y ≤ 0} ⊂ ℝd+1
    is defined by a radial function U satisfying the SIC, U(x) = u(|x|), with x =
    (x1,...,xd), u(ξ) &lt; 0 for 0 ≤ ξ &lt; 1, and u(ξ) = 0 for ξ ≥ 1, and the flow
    is parallel to the y-axis. The minimal resistance is greater than 0.5 (and coincides
    with 0.6435 when d = 1) and converges to 0.5 as d → ∞.'
article_processing_charge: No
arxiv: 1
author:
- first_name: Arseniy
  full_name: Akopyan, Arseniy
  id: 430D2C90-F248-11E8-B48F-1D18A9856A87
  last_name: Akopyan
  orcid: 0000-0002-2548-617X
- first_name: Alexander
  full_name: Plakhov, Alexander
  last_name: Plakhov
citation:
  ama: Akopyan A, Plakhov A. Minimal resistance of curves under the single impact
    assumption. <i>Society for Industrial and Applied Mathematics</i>. 2015;47(4):2754-2769.
    doi:<a href="https://doi.org/10.1137/140993843">10.1137/140993843</a>
  apa: Akopyan, A., &#38; Plakhov, A. (2015). Minimal resistance of curves under the
    single impact assumption. <i>Society for Industrial and Applied Mathematics</i>.
    SIAM. <a href="https://doi.org/10.1137/140993843">https://doi.org/10.1137/140993843</a>
  chicago: Akopyan, Arseniy, and Alexander Plakhov. “Minimal Resistance of Curves
    under the Single Impact Assumption.” <i>Society for Industrial and Applied Mathematics</i>.
    SIAM, 2015. <a href="https://doi.org/10.1137/140993843">https://doi.org/10.1137/140993843</a>.
  ieee: A. Akopyan and A. Plakhov, “Minimal resistance of curves under the single
    impact assumption,” <i>Society for Industrial and Applied Mathematics</i>, vol.
    47, no. 4. SIAM, pp. 2754–2769, 2015.
  ista: Akopyan A, Plakhov A. 2015. Minimal resistance of curves under the single
    impact assumption. Society for Industrial and Applied Mathematics. 47(4), 2754–2769.
  mla: Akopyan, Arseniy, and Alexander Plakhov. “Minimal Resistance of Curves under
    the Single Impact Assumption.” <i>Society for Industrial and Applied Mathematics</i>,
    vol. 47, no. 4, SIAM, 2015, pp. 2754–69, doi:<a href="https://doi.org/10.1137/140993843">10.1137/140993843</a>.
  short: A. Akopyan, A. Plakhov, Society for Industrial and Applied Mathematics 47
    (2015) 2754–2769.
date_created: 2018-12-11T11:53:36Z
date_published: 2015-07-14T00:00:00Z
date_updated: 2025-09-23T09:35:36Z
day: '14'
department:
- _id: HeEd
doi: 10.1137/140993843
ec_funded: 1
external_id:
  arxiv:
  - '1410.3736'
  isi:
  - '000360691500009'
intvolume: '        47'
isi: 1
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: http://arxiv.org/abs/1410.3736
month: '07'
oa: 1
oa_version: Preprint
page: 2754 - 2769
project:
- _id: 25681D80-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '291734'
  name: International IST Postdoc Fellowship Programme
publication: Society for Industrial and Applied Mathematics
publication_status: published
publisher: SIAM
publist_id: '5423'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Minimal resistance of curves under the single impact assumption
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 47
year: '2015'
...
---
_id: '1938'
abstract:
- lang: eng
  text: 'We numerically investigate the distribution of extrema of ''chaotic'' Laplacian
    eigenfunctions on two-dimensional manifolds. Our contribution is two-fold: (a)
    we count extrema on grid graphs with a small number of randomly added edges and
    show the behavior to coincide with the 1957 prediction of Longuet-Higgins for
    the continuous case and (b) we compute the regularity of their spatial distribution
    using discrepancy, which is a classical measure from the theory of Monte Carlo
    integration. The first part suggests that grid graphs with randomly added edges
    should behave like two-dimensional surfaces with ergodic geodesic flow; in the
    second part we show that the extrema are more regularly distributed in space than
    the grid Z2.'
acknowledgement: "F.P. was supported by the Graduate School of IST Austria. S.S. was
  partially supported by CRC1060 of the DFG\r\nThe authors thank Olga Symonova and
  Michael Kerber for sharing their implementation of the persistence algorithm. "
article_processing_charge: No
author:
- first_name: Florian
  full_name: Pausinger, Florian
  id: 2A77D7A2-F248-11E8-B48F-1D18A9856A87
  last_name: Pausinger
  orcid: 0000-0002-8379-3768
- first_name: Stefan
  full_name: Steinerberger, Stefan
  last_name: Steinerberger
citation:
  ama: Pausinger F, Steinerberger S. On the distribution of local extrema in quantum
    chaos. <i>Physics Letters, Section A</i>. 2015;379(6):535-541. doi:<a href="https://doi.org/10.1016/j.physleta.2014.12.010">10.1016/j.physleta.2014.12.010</a>
  apa: Pausinger, F., &#38; Steinerberger, S. (2015). On the distribution of local
    extrema in quantum chaos. <i>Physics Letters, Section A</i>. Elsevier. <a href="https://doi.org/10.1016/j.physleta.2014.12.010">https://doi.org/10.1016/j.physleta.2014.12.010</a>
  chicago: Pausinger, Florian, and Stefan Steinerberger. “On the Distribution of Local
    Extrema in Quantum Chaos.” <i>Physics Letters, Section A</i>. Elsevier, 2015.
    <a href="https://doi.org/10.1016/j.physleta.2014.12.010">https://doi.org/10.1016/j.physleta.2014.12.010</a>.
  ieee: F. Pausinger and S. Steinerberger, “On the distribution of local extrema in
    quantum chaos,” <i>Physics Letters, Section A</i>, vol. 379, no. 6. Elsevier,
    pp. 535–541, 2015.
  ista: Pausinger F, Steinerberger S. 2015. On the distribution of local extrema in
    quantum chaos. Physics Letters, Section A. 379(6), 535–541.
  mla: Pausinger, Florian, and Stefan Steinerberger. “On the Distribution of Local
    Extrema in Quantum Chaos.” <i>Physics Letters, Section A</i>, vol. 379, no. 6,
    Elsevier, 2015, pp. 535–41, doi:<a href="https://doi.org/10.1016/j.physleta.2014.12.010">10.1016/j.physleta.2014.12.010</a>.
  short: F. Pausinger, S. Steinerberger, Physics Letters, Section A 379 (2015) 535–541.
corr_author: '1'
date_created: 2018-12-11T11:54:49Z
date_published: 2015-03-06T00:00:00Z
date_updated: 2025-09-23T09:44:12Z
day: '06'
department:
- _id: HeEd
doi: 10.1016/j.physleta.2014.12.010
external_id:
  isi:
  - '000349586000006'
intvolume: '       379'
isi: 1
issue: '6'
language:
- iso: eng
month: '03'
oa_version: None
page: 535 - 541
publication: Physics Letters, Section A
publication_status: published
publisher: Elsevier
publist_id: '5152'
quality_controlled: '1'
scopus_import: '1'
status: public
title: On the distribution of local extrema in quantum chaos
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 379
year: '2015'
...
---
_id: '2035'
abstract:
- lang: eng
  text: "Considering a continuous self-map and the induced endomorphism on homology,
    we study the eigenvalues and eigenspaces of the latter. Taking a filtration of
    representations, we define the persistence of the eigenspaces, effectively introducing
    a hierarchical organization of the map. The algorithm that computes this information
    for a finite sample is proved to be stable, and to give the correct answer for
    a sufficiently dense sample. Results computed with an implementation of the algorithm
    provide evidence of its practical utility.\r\n"
acknowledgement: This research is partially supported by the Toposys project FP7-ICT-318493-STREP,
  by ESF under the ACAT Research Network Programme, by the Russian Government under
  mega project 11.G34.31.0053, and by the Polish National Science Center under Grant
  No. N201 419639.
article_processing_charge: No
author:
- first_name: Herbert
  full_name: Edelsbrunner, Herbert
  id: 3FB178DA-F248-11E8-B48F-1D18A9856A87
  last_name: Edelsbrunner
  orcid: 0000-0002-9823-6833
- first_name: Grzegorz
  full_name: Jablonski, Grzegorz
  id: 4483EF78-F248-11E8-B48F-1D18A9856A87
  last_name: Jablonski
  orcid: 0000-0002-3536-9866
- first_name: Marian
  full_name: Mrozek, Marian
  last_name: Mrozek
citation:
  ama: Edelsbrunner H, Jablonski G, Mrozek M. The persistent homology of a self-map.
    <i>Foundations of Computational Mathematics</i>. 2015;15(5):1213-1244. doi:<a
    href="https://doi.org/10.1007/s10208-014-9223-y">10.1007/s10208-014-9223-y</a>
  apa: Edelsbrunner, H., Jablonski, G., &#38; Mrozek, M. (2015). The persistent homology
    of a self-map. <i>Foundations of Computational Mathematics</i>. Springer. <a href="https://doi.org/10.1007/s10208-014-9223-y">https://doi.org/10.1007/s10208-014-9223-y</a>
  chicago: Edelsbrunner, Herbert, Grzegorz Jablonski, and Marian Mrozek. “The Persistent
    Homology of a Self-Map.” <i>Foundations of Computational Mathematics</i>. Springer,
    2015. <a href="https://doi.org/10.1007/s10208-014-9223-y">https://doi.org/10.1007/s10208-014-9223-y</a>.
  ieee: H. Edelsbrunner, G. Jablonski, and M. Mrozek, “The persistent homology of
    a self-map,” <i>Foundations of Computational Mathematics</i>, vol. 15, no. 5.
    Springer, pp. 1213–1244, 2015.
  ista: Edelsbrunner H, Jablonski G, Mrozek M. 2015. The persistent homology of a
    self-map. Foundations of Computational Mathematics. 15(5), 1213–1244.
  mla: Edelsbrunner, Herbert, et al. “The Persistent Homology of a Self-Map.” <i>Foundations
    of Computational Mathematics</i>, vol. 15, no. 5, Springer, 2015, pp. 1213–44,
    doi:<a href="https://doi.org/10.1007/s10208-014-9223-y">10.1007/s10208-014-9223-y</a>.
  short: H. Edelsbrunner, G. Jablonski, M. Mrozek, Foundations of Computational Mathematics
    15 (2015) 1213–1244.
date_created: 2018-12-11T11:55:20Z
date_published: 2015-10-01T00:00:00Z
date_updated: 2025-09-23T14:08:54Z
day: '01'
ddc:
- '000'
department:
- _id: HeEd
doi: 10.1007/s10208-014-9223-y
ec_funded: 1
external_id:
  isi:
  - '000360862900004'
file:
- access_level: open_access
  checksum: 3566f3a8b0c1bc550e62914a88c584ff
  content_type: application/pdf
  creator: system
  date_created: 2018-12-12T10:08:10Z
  date_updated: 2020-07-14T12:45:26Z
  file_id: '4670'
  file_name: IST-2016-486-v1+1_s10208-014-9223-y.pdf
  file_size: 1317546
  relation: main_file
file_date_updated: 2020-07-14T12:45:26Z
has_accepted_license: '1'
intvolume: '        15'
isi: 1
issue: '5'
language:
- iso: eng
month: '10'
oa: 1
oa_version: Published Version
page: 1213 - 1244
project:
- _id: 255D761E-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '318493'
  name: Topological Complex Systems
publication: Foundations of Computational Mathematics
publication_status: published
publisher: Springer
publist_id: '5022'
pubrep_id: '486'
quality_controlled: '1'
scopus_import: '1'
status: public
title: The persistent homology of a self-map
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 15
year: '2015'
...
---
_id: '9737'
article_processing_charge: No
author:
- first_name: Olga
  full_name: Symonova, Olga
  id: 3C0C7BC6-F248-11E8-B48F-1D18A9856A87
  last_name: Symonova
  orcid: 0000-0003-2012-9947
- first_name: Christopher
  full_name: Topp, Christopher
  last_name: Topp
- first_name: Herbert
  full_name: Edelsbrunner, Herbert
  id: 3FB178DA-F248-11E8-B48F-1D18A9856A87
  last_name: Edelsbrunner
  orcid: 0000-0002-9823-6833
citation:
  ama: Symonova O, Topp C, Edelsbrunner H. Root traits computed by DynamicRoots for
    the maize root shown in fig 2. 2015. doi:<a href="https://doi.org/10.1371/journal.pone.0127657.s001">10.1371/journal.pone.0127657.s001</a>
  apa: Symonova, O., Topp, C., &#38; Edelsbrunner, H. (2015). Root traits computed
    by DynamicRoots for the maize root shown in fig 2. Public Library of Science.
    <a href="https://doi.org/10.1371/journal.pone.0127657.s001">https://doi.org/10.1371/journal.pone.0127657.s001</a>
  chicago: Symonova, Olga, Christopher Topp, and Herbert Edelsbrunner. “Root Traits
    Computed by DynamicRoots for the Maize Root Shown in Fig 2.” Public Library of
    Science, 2015. <a href="https://doi.org/10.1371/journal.pone.0127657.s001">https://doi.org/10.1371/journal.pone.0127657.s001</a>.
  ieee: O. Symonova, C. Topp, and H. Edelsbrunner, “Root traits computed by DynamicRoots
    for the maize root shown in fig 2.” Public Library of Science, 2015.
  ista: Symonova O, Topp C, Edelsbrunner H. 2015. Root traits computed by DynamicRoots
    for the maize root shown in fig 2, Public Library of Science, <a href="https://doi.org/10.1371/journal.pone.0127657.s001">10.1371/journal.pone.0127657.s001</a>.
  mla: Symonova, Olga, et al. <i>Root Traits Computed by DynamicRoots for the Maize
    Root Shown in Fig 2</i>. Public Library of Science, 2015, doi:<a href="https://doi.org/10.1371/journal.pone.0127657.s001">10.1371/journal.pone.0127657.s001</a>.
  short: O. Symonova, C. Topp, H. Edelsbrunner, (2015).
date_created: 2021-07-28T06:20:13Z
date_published: 2015-06-01T00:00:00Z
date_updated: 2025-09-23T08:30:43Z
day: '01'
department:
- _id: MaJö
- _id: HeEd
doi: 10.1371/journal.pone.0127657.s001
month: '06'
oa_version: Published Version
publisher: Public Library of Science
related_material:
  record:
  - id: '1793'
    relation: used_in_publication
    status: public
status: public
title: Root traits computed by DynamicRoots for the maize root shown in fig 2
type: research_data_reference
user_id: 6785fbc1-c503-11eb-8a32-93094b40e1cf
year: '2015'
...
---
_id: '1793'
abstract:
- lang: eng
  text: We present a software platform for reconstructing and analyzing the growth
    of a plant root system from a time-series of 3D voxelized shapes. It aligns the
    shapes with each other, constructs a geometric graph representation together with
    the function that records the time of growth, and organizes the branches into
    a hierarchy that reflects the order of creation. The software includes the automatic
    computation of structural and dynamic traits for each root in the system enabling
    the quantification of growth on fine-scale. These are important advances in plant
    phenotyping with applications to the study of genetic and environmental influences
    on growth.
article_number: e0127657
article_processing_charge: No
author:
- first_name: Olga
  full_name: Symonova, Olga
  id: 3C0C7BC6-F248-11E8-B48F-1D18A9856A87
  last_name: Symonova
  orcid: 0000-0003-2012-9947
- first_name: Christopher
  full_name: Topp, Christopher
  last_name: Topp
- first_name: Herbert
  full_name: Edelsbrunner, Herbert
  id: 3FB178DA-F248-11E8-B48F-1D18A9856A87
  last_name: Edelsbrunner
  orcid: 0000-0002-9823-6833
citation:
  ama: 'Symonova O, Topp C, Edelsbrunner H. DynamicRoots: A software platform for
    the reconstruction and analysis of growing plant roots. <i>PLoS One</i>. 2015;10(6).
    doi:<a href="https://doi.org/10.1371/journal.pone.0127657">10.1371/journal.pone.0127657</a>'
  apa: 'Symonova, O., Topp, C., &#38; Edelsbrunner, H. (2015). DynamicRoots: A software
    platform for the reconstruction and analysis of growing plant roots. <i>PLoS One</i>.
    Public Library of Science. <a href="https://doi.org/10.1371/journal.pone.0127657">https://doi.org/10.1371/journal.pone.0127657</a>'
  chicago: 'Symonova, Olga, Christopher Topp, and Herbert Edelsbrunner. “DynamicRoots:
    A Software Platform for the Reconstruction and Analysis of Growing Plant Roots.”
    <i>PLoS One</i>. Public Library of Science, 2015. <a href="https://doi.org/10.1371/journal.pone.0127657">https://doi.org/10.1371/journal.pone.0127657</a>.'
  ieee: 'O. Symonova, C. Topp, and H. Edelsbrunner, “DynamicRoots: A software platform
    for the reconstruction and analysis of growing plant roots,” <i>PLoS One</i>,
    vol. 10, no. 6. Public Library of Science, 2015.'
  ista: 'Symonova O, Topp C, Edelsbrunner H. 2015. DynamicRoots: A software platform
    for the reconstruction and analysis of growing plant roots. PLoS One. 10(6), e0127657.'
  mla: 'Symonova, Olga, et al. “DynamicRoots: A Software Platform for the Reconstruction
    and Analysis of Growing Plant Roots.” <i>PLoS One</i>, vol. 10, no. 6, e0127657,
    Public Library of Science, 2015, doi:<a href="https://doi.org/10.1371/journal.pone.0127657">10.1371/journal.pone.0127657</a>.'
  short: O. Symonova, C. Topp, H. Edelsbrunner, PLoS One 10 (2015).
corr_author: '1'
date_created: 2018-12-11T11:54:02Z
date_published: 2015-06-01T00:00:00Z
date_updated: 2025-09-23T08:30:43Z
day: '01'
ddc:
- '000'
department:
- _id: MaJö
- _id: HeEd
doi: 10.1371/journal.pone.0127657
external_id:
  isi:
  - '000356630900069'
file:
- access_level: open_access
  checksum: d20f26461ca575276ad3ed9ce4bfc787
  content_type: application/pdf
  creator: system
  date_created: 2018-12-12T10:15:30Z
  date_updated: 2020-07-14T12:45:16Z
  file_id: '5150'
  file_name: IST-2016-454-v1+1_journal.pone.0127657.pdf
  file_size: 1850825
  relation: main_file
file_date_updated: 2020-07-14T12:45:16Z
has_accepted_license: '1'
intvolume: '        10'
isi: 1
issue: '6'
language:
- iso: eng
month: '06'
oa: 1
oa_version: Published Version
publication: PLoS One
publication_status: published
publisher: Public Library of Science
publist_id: '5318'
pubrep_id: '454'
quality_controlled: '1'
related_material:
  record:
  - id: '9737'
    relation: research_data
    status: public
scopus_import: '1'
status: public
title: 'DynamicRoots: A software platform for the reconstruction and analysis of growing
  plant roots'
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 10
year: '2015'
...
---
OA_place: publisher
OA_type: free access
_id: '1805'
abstract:
- lang: eng
  text: 'We consider the problem of deciding whether the persistent homology group
    of a simplicial pair (K,L) can be realized as the homology H∗(X) of some complex
    X with L ⊂ X ⊂ K. We show that this problem is NP-complete even if K is embedded
    in double-struck R3. As a consequence, we show that it is NP-hard to simplify
    level and sublevel sets of scalar functions on double-struck S3 within a given
    tolerance constraint. This problem has relevance to the visualization of medical
    images by isosurfaces. We also show an implication to the theory of well groups
    of scalar functions: not every well group can be realized by some level set, and
    deciding whether a well group can be realized is NP-hard.'
article_processing_charge: No
article_type: original
author:
- first_name: Dominique
  full_name: Attali, Dominique
  last_name: Attali
- first_name: Ulrich
  full_name: Bauer, Ulrich
  id: 2ADD483A-F248-11E8-B48F-1D18A9856A87
  last_name: Bauer
  orcid: 0000-0002-9683-0724
- first_name: Olivier
  full_name: Devillers, Olivier
  last_name: Devillers
- first_name: Marc
  full_name: Glisse, Marc
  last_name: Glisse
- first_name: André
  full_name: Lieutier, André
  last_name: Lieutier
citation:
  ama: 'Attali D, Bauer U, Devillers O, Glisse M, Lieutier A. Homological reconstruction
    and simplification in R3. <i>Computational Geometry: Theory and Applications</i>.
    2015;48(8):606-621. doi:<a href="https://doi.org/10.1016/j.comgeo.2014.08.010">10.1016/j.comgeo.2014.08.010</a>'
  apa: 'Attali, D., Bauer, U., Devillers, O., Glisse, M., &#38; Lieutier, A. (2015).
    Homological reconstruction and simplification in R3. <i>Computational Geometry:
    Theory and Applications</i>. Elsevier. <a href="https://doi.org/10.1016/j.comgeo.2014.08.010">https://doi.org/10.1016/j.comgeo.2014.08.010</a>'
  chicago: 'Attali, Dominique, Ulrich Bauer, Olivier Devillers, Marc Glisse, and André
    Lieutier. “Homological Reconstruction and Simplification in R3.” <i>Computational
    Geometry: Theory and Applications</i>. Elsevier, 2015. <a href="https://doi.org/10.1016/j.comgeo.2014.08.010">https://doi.org/10.1016/j.comgeo.2014.08.010</a>.'
  ieee: 'D. Attali, U. Bauer, O. Devillers, M. Glisse, and A. Lieutier, “Homological
    reconstruction and simplification in R3,” <i>Computational Geometry: Theory and
    Applications</i>, vol. 48, no. 8. Elsevier, pp. 606–621, 2015.'
  ista: 'Attali D, Bauer U, Devillers O, Glisse M, Lieutier A. 2015. Homological reconstruction
    and simplification in R3. Computational Geometry: Theory and Applications. 48(8),
    606–621.'
  mla: 'Attali, Dominique, et al. “Homological Reconstruction and Simplification in
    R3.” <i>Computational Geometry: Theory and Applications</i>, vol. 48, no. 8, Elsevier,
    2015, pp. 606–21, doi:<a href="https://doi.org/10.1016/j.comgeo.2014.08.010">10.1016/j.comgeo.2014.08.010</a>.'
  short: 'D. Attali, U. Bauer, O. Devillers, M. Glisse, A. Lieutier, Computational
    Geometry: Theory and Applications 48 (2015) 606–621.'
corr_author: '1'
date_created: 2018-12-11T11:54:06Z
date_published: 2015-06-03T00:00:00Z
date_updated: 2026-06-18T17:57:28Z
day: '03'
ddc:
- '500'
department:
- _id: HeEd
doi: 10.1016/j.comgeo.2014.08.010
ec_funded: 1
external_id:
  isi:
  - '000357353200006'
intvolume: '        48'
isi: 1
issue: '8'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1016/j.comgeo.2014.08.010
month: '06'
oa: 1
oa_version: Published Version
page: 606 - 621
project:
- _id: 255D761E-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '318493'
  name: Topological Complex Systems
publication: 'Computational Geometry: Theory and Applications'
publication_status: published
publisher: Elsevier
publist_id: '5305'
quality_controlled: '1'
related_material:
  record:
  - id: '2812'
    relation: earlier_version
    status: public
scopus_import: '1'
status: public
title: Homological reconstruction and simplification in R3
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 48
year: '2015'
...
---
_id: '1828'
abstract:
- lang: eng
  text: We construct a non-linear Markov process connected with a biological model
    of a bacterial genome recombination. The description of invariant measures of
    this process gives us the solution of one problem in elementary probability theory.
article_processing_charge: No
arxiv: 1
author:
- first_name: Arseniy
  full_name: Akopyan, Arseniy
  id: 430D2C90-F248-11E8-B48F-1D18A9856A87
  last_name: Akopyan
  orcid: 0000-0002-2548-617X
- first_name: Sergey
  full_name: Pirogov, Sergey
  last_name: Pirogov
- first_name: Aleksandr
  full_name: Rybko, Aleksandr
  last_name: Rybko
citation:
  ama: Akopyan A, Pirogov S, Rybko A. Invariant measures of genetic recombination
    process. <i>Journal of Statistical Physics</i>. 2015;160(1):163-167. doi:<a href="https://doi.org/10.1007/s10955-015-1238-5">10.1007/s10955-015-1238-5</a>
  apa: Akopyan, A., Pirogov, S., &#38; Rybko, A. (2015). Invariant measures of genetic
    recombination process. <i>Journal of Statistical Physics</i>. Springer. <a href="https://doi.org/10.1007/s10955-015-1238-5">https://doi.org/10.1007/s10955-015-1238-5</a>
  chicago: Akopyan, Arseniy, Sergey Pirogov, and Aleksandr Rybko. “Invariant Measures
    of Genetic Recombination Process.” <i>Journal of Statistical Physics</i>. Springer,
    2015. <a href="https://doi.org/10.1007/s10955-015-1238-5">https://doi.org/10.1007/s10955-015-1238-5</a>.
  ieee: A. Akopyan, S. Pirogov, and A. Rybko, “Invariant measures of genetic recombination
    process,” <i>Journal of Statistical Physics</i>, vol. 160, no. 1. Springer, pp.
    163–167, 2015.
  ista: Akopyan A, Pirogov S, Rybko A. 2015. Invariant measures of genetic recombination
    process. Journal of Statistical Physics. 160(1), 163–167.
  mla: Akopyan, Arseniy, et al. “Invariant Measures of Genetic Recombination Process.”
    <i>Journal of Statistical Physics</i>, vol. 160, no. 1, Springer, 2015, pp. 163–67,
    doi:<a href="https://doi.org/10.1007/s10955-015-1238-5">10.1007/s10955-015-1238-5</a>.
  short: A. Akopyan, S. Pirogov, A. Rybko, Journal of Statistical Physics 160 (2015)
    163–167.
corr_author: '1'
date_created: 2018-12-11T11:54:14Z
date_published: 2015-07-01T00:00:00Z
date_updated: 2025-09-23T09:23:53Z
day: '01'
department:
- _id: HeEd
doi: 10.1007/s10955-015-1238-5
ec_funded: 1
external_id:
  arxiv:
  - '1406.5313'
  isi:
  - '000356579000009'
intvolume: '       160'
isi: 1
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.48550/arXiv.1406.5313
month: '07'
oa: 1
oa_version: Preprint
page: 163 - 167
project:
- _id: 25681D80-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '291734'
  name: International IST Postdoc Fellowship Programme
publication: Journal of Statistical Physics
publication_status: published
publisher: Springer
publist_id: '5276'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Invariant measures of genetic recombination process
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 160
year: '2015'
...
---
_id: '1555'
abstract:
- lang: eng
  text: We show that incorporating spatial dispersal of individuals into a simple
    vaccination epidemic model may give rise to a model that exhibits rich dynamical
    behavior. Using an SIVS (susceptible-infected-vaccinated-susceptible) model as
    a basis, we describe the spread of an infectious disease in a population split
    into two regions. In each subpopulation, both forward and backward bifurcations
    can occur. This implies that for disconnected regions the two-patch system may
    admit several steady states. We consider traveling between the regions and investigate
    the impact of spatial dispersal of individuals on the model dynamics. We establish
    conditions for the existence of multiple nontrivial steady states in the system,
    and we study the structure of the equilibria. The mathematical analysis reveals
    an unusually rich dynamical behavior, not normally found in the simple epidemic
    models. In addition to the disease-free equilibrium, eight endemic equilibria
    emerge from backward transcritical and saddle-node bifurcation points, forming
    an interesting bifurcation diagram. Stability of steady states, their bifurcations,
    and the global dynamics are investigated with analytical tools, numerical simulations,
    and rigorous set-oriented numerical computations.
acknowledgement: Institute of Science and Technology Austria, Am Campus 1, 3400 Klosterneuburg,
  Austria (pawel.pilarczyk@ist.ac.at). This author’s work was partially supported
  by the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework
  Programme (FP7/2007-2013) under REA grant agreement 622033, by Fundo Europeu de
  Desenvolvimento Regional (FEDER) through COMPETE—Programa Operacional Factores de
  Competitividade (POFC), by the Portuguese national funds through Funda ̧caoparaaCiˆencia
  e a Tecnologia (FCT) in the framework of the research project FCOMP-01-0124-FEDER-010645
  (ref. FCT PTDC/MAT/098871/2008), and by European Research Council through StG 259559
  in the framework of the EPIDELAY project.
article_processing_charge: No
article_type: original
author:
- first_name: Diána
  full_name: Knipl, Diána
  last_name: Knipl
- first_name: Pawel
  full_name: Pilarczyk, Pawel
  id: 3768D56A-F248-11E8-B48F-1D18A9856A87
  last_name: Pilarczyk
- first_name: Gergely
  full_name: Röst, Gergely
  last_name: Röst
citation:
  ama: Knipl D, Pilarczyk P, Röst G. Rich bifurcation structure in a two patch vaccination
    model. <i>SIAM Journal on Applied Dynamical Systems</i>. 2015;14(2):980-1017.
    doi:<a href="https://doi.org/10.1137/140993934">10.1137/140993934</a>
  apa: Knipl, D., Pilarczyk, P., &#38; Röst, G. (2015). Rich bifurcation structure
    in a two patch vaccination model. <i>SIAM Journal on Applied Dynamical Systems</i>.
    Society for Industrial and Applied Mathematics. <a href="https://doi.org/10.1137/140993934">https://doi.org/10.1137/140993934</a>
  chicago: Knipl, Diána, Pawel Pilarczyk, and Gergely Röst. “Rich Bifurcation Structure
    in a Two Patch Vaccination Model.” <i>SIAM Journal on Applied Dynamical Systems</i>.
    Society for Industrial and Applied Mathematics, 2015. <a href="https://doi.org/10.1137/140993934">https://doi.org/10.1137/140993934</a>.
  ieee: D. Knipl, P. Pilarczyk, and G. Röst, “Rich bifurcation structure in a two
    patch vaccination model,” <i>SIAM Journal on Applied Dynamical Systems</i>, vol.
    14, no. 2. Society for Industrial and Applied Mathematics, pp. 980–1017, 2015.
  ista: Knipl D, Pilarczyk P, Röst G. 2015. Rich bifurcation structure in a two patch
    vaccination model. SIAM Journal on Applied Dynamical Systems. 14(2), 980–1017.
  mla: Knipl, Diána, et al. “Rich Bifurcation Structure in a Two Patch Vaccination
    Model.” <i>SIAM Journal on Applied Dynamical Systems</i>, vol. 14, no. 2, Society
    for Industrial and Applied Mathematics, 2015, pp. 980–1017, doi:<a href="https://doi.org/10.1137/140993934">10.1137/140993934</a>.
  short: D. Knipl, P. Pilarczyk, G. Röst, SIAM Journal on Applied Dynamical Systems
    14 (2015) 980–1017.
das_tickbox: '1'
date_created: 2018-12-11T11:52:42Z
date_published: 2015-01-01T00:00:00Z
date_updated: 2026-07-06T13:59:25Z
day: '01'
ddc:
- '510'
department:
- _id: HeEd
doi: 10.1137/140993934
ec_funded: 1
external_id:
  isi:
  - '000357310400015'
intvolume: '        14'
isi: 1
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: http://discovery.ucl.ac.uk/1473750/1/99393.pdf
month: '01'
oa: 1
oa_version: Published Version
page: 980 - 1017
project:
- _id: 255F06BE-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '622033'
  name: Persistent Homology - Images, Data and Maps
publication: SIAM Journal on Applied Dynamical Systems
publication_identifier:
  eissn:
  - 1536-0040
publication_status: published
publisher: Society for Industrial and Applied Mathematics
publist_id: '5616'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Rich bifurcation structure in a two patch vaccination model
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 14
year: '2015'
...
---
_id: '1792'
abstract:
- lang: eng
  text: Motivated by recent ideas of Harman (Unif. Distrib. Theory, 2010) we develop
    a new concept of variation of multivariate functions on a compact Hausdorff space
    with respect to a collection D of subsets. We prove a general version of the Koksma-Hlawka
    theorem that holds for this notion of variation and discrepancy with respect to
    D. As special cases, we obtain Koksma-Hlawka inequalities for classical notions,
    such as extreme or isotropic discrepancy. For extreme discrepancy, our result
    coincides with the usual Koksma-Hlawka theorem. We show that the space of functions
    of bounded D-variation contains important discontinuous functions and is closed
    under natural algebraic operations. Finally, we illustrate the results on concrete
    integration problems from integral geometry and stereology.
acknowledgement: F.P. is supported by the Graduate School of IST Austria, A.M.S is
  supported by the Centre for Stochastic Geometry and Advanced Bioimaging funded by
  a grant from the Villum Foundation.
article_processing_charge: No
author:
- first_name: Florian
  full_name: Pausinger, Florian
  id: 2A77D7A2-F248-11E8-B48F-1D18A9856A87
  last_name: Pausinger
  orcid: 0000-0002-8379-3768
- first_name: Anne
  full_name: Svane, Anne
  last_name: Svane
citation:
  ama: Pausinger F, Svane A. A Koksma-Hlawka inequality for general discrepancy systems.
    <i>Journal of Complexity</i>. 2015;31(6):773-797. doi:<a href="https://doi.org/10.1016/j.jco.2015.06.002">10.1016/j.jco.2015.06.002</a>
  apa: Pausinger, F., &#38; Svane, A. (2015). A Koksma-Hlawka inequality for general
    discrepancy systems. <i>Journal of Complexity</i>. Academic Press. <a href="https://doi.org/10.1016/j.jco.2015.06.002">https://doi.org/10.1016/j.jco.2015.06.002</a>
  chicago: Pausinger, Florian, and Anne Svane. “A Koksma-Hlawka Inequality for General
    Discrepancy Systems.” <i>Journal of Complexity</i>. Academic Press, 2015. <a href="https://doi.org/10.1016/j.jco.2015.06.002">https://doi.org/10.1016/j.jco.2015.06.002</a>.
  ieee: F. Pausinger and A. Svane, “A Koksma-Hlawka inequality for general discrepancy
    systems,” <i>Journal of Complexity</i>, vol. 31, no. 6. Academic Press, pp. 773–797,
    2015.
  ista: Pausinger F, Svane A. 2015. A Koksma-Hlawka inequality for general discrepancy
    systems. Journal of Complexity. 31(6), 773–797.
  mla: Pausinger, Florian, and Anne Svane. “A Koksma-Hlawka Inequality for General
    Discrepancy Systems.” <i>Journal of Complexity</i>, vol. 31, no. 6, Academic Press,
    2015, pp. 773–97, doi:<a href="https://doi.org/10.1016/j.jco.2015.06.002">10.1016/j.jco.2015.06.002</a>.
  short: F. Pausinger, A. Svane, Journal of Complexity 31 (2015) 773–797.
corr_author: '1'
date_created: 2018-12-11T11:54:02Z
date_published: 2015-12-01T00:00:00Z
date_updated: 2026-07-29T10:08:33Z
day: '01'
department:
- _id: HeEd
doi: 10.1016/j.jco.2015.06.002
external_id:
  isi:
  - '000362926900001'
intvolume: '        31'
isi: 1
issue: '6'
language:
- iso: eng
month: '12'
oa_version: None
page: 773 - 797
publication: Journal of Complexity
publication_status: published
publisher: Academic Press
publist_id: '5320'
quality_controlled: '1'
related_material:
  record:
  - id: '1399'
    relation: dissertation_contains
    status: public
scopus_import: '1'
status: public
title: A Koksma-Hlawka inequality for general discrepancy systems
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 31
year: '2015'
...
---
OA_place: publisher
_id: '1399'
abstract:
- lang: eng
  text: This thesis is concerned with the computation and approximation of intrinsic
    volumes. Given a smooth body M and a certain digital approximation of it, we develop
    algorithms to approximate various intrinsic volumes of M using only measurements
    taken from its digital approximations. The crucial idea behind our novel algorithms
    is to link the recent theory of persistent homology to the theory of intrinsic
    volumes via the Crofton formula from integral geometry and, in particular, via
    Euler characteristic computations. Our main contributions are a multigrid convergent
    digital algorithm to compute the first intrinsic volume of a solid body in R^n
    as well as an appropriate integration pipeline to approximate integral-geometric
    integrals defined over the Grassmannian manifold.
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Florian
  full_name: Pausinger, Florian
  id: 2A77D7A2-F248-11E8-B48F-1D18A9856A87
  last_name: Pausinger
  orcid: 0000-0002-8379-3768
citation:
  ama: Pausinger F. On the approximation of intrinsic volumes. 2015.
  apa: Pausinger, F. (2015). <i>On the approximation of intrinsic volumes</i>. Institute
    of Science and Technology Austria.
  chicago: Pausinger, Florian. “On the Approximation of Intrinsic Volumes.” Institute
    of Science and Technology Austria, 2015.
  ieee: F. Pausinger, “On the approximation of intrinsic volumes,” Institute of Science
    and Technology Austria, 2015.
  ista: Pausinger F. 2015. On the approximation of intrinsic volumes. Institute of
    Science and Technology Austria.
  mla: Pausinger, Florian. <i>On the Approximation of Intrinsic Volumes</i>. Institute
    of Science and Technology Austria, 2015.
  short: F. Pausinger, On the Approximation of Intrinsic Volumes, Institute of Science
    and Technology Austria, 2015.
corr_author: '1'
date_created: 2018-12-11T11:51:48Z
date_published: 2015-06-01T00:00:00Z
date_updated: 2026-07-29T10:08:34Z
day: '01'
degree_awarded: PhD
department:
- _id: HeEd
- _id: GradSch
doi_confirm: '1'
language:
- iso: eng
month: '06'
oa_version: None
page: '144'
publication_identifier:
  issn:
  - 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
publist_id: '5808'
related_material:
  record:
  - id: '1662'
    relation: part_of_dissertation
    status: public
  - id: '1792'
    relation: part_of_dissertation
    status: public
  - id: '2255'
    relation: part_of_dissertation
    status: public
status: public
supervisor:
- first_name: Herbert
  full_name: Edelsbrunner, Herbert
  id: 3FB178DA-F248-11E8-B48F-1D18A9856A87
  last_name: Edelsbrunner
  orcid: 0000-0002-9823-6833
title: On the approximation of intrinsic volumes
type: dissertation
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
year: '2015'
...
