{"language":[{"iso":"eng"}],"publication_status":"published","page":"209 - 216","type":"conference","doi":"10.1145/1993886.1993920","_id":"3330","scopus_import":1,"oa":1,"abstract":[{"text":"We consider the problem of approximating all real roots of a square-free polynomial f. Given isolating intervals, our algorithm refines each of them to a width at most 2-L, that is, each of the roots is approximated to L bits after the binary point. Our method provides a certified answer for arbitrary real polynomials, only requiring finite approximations of the polynomial coefficient and choosing a suitable working precision adaptively. In this way, we get a correct algorithm that is simple to implement and practically efficient. Our algorithm uses the quadratic interval refinement method; we adapt that method to be able to cope with inaccuracies when evaluating f, without sacrificing its quadratic convergence behavior. We prove a bound on the bit complexity of our algorithm in terms of degree, coefficient size and discriminant. Our bound improves previous work on integer polynomials by a factor of deg f and essentially matches best known theoretical bounds on root approximation which are obtained by very sophisticated algorithms.","lang":"eng"}],"date_updated":"2021-01-12T07:42:42Z","publist_id":"3304","oa_version":"Preprint","conference":{"end_date":"2011-06-11","name":"ISSAC: International Symposium on Symbolic and Algebraic Computation","start_date":"2011-06-08","location":"California, USA"},"author":[{"id":"36E4574A-F248-11E8-B48F-1D18A9856A87","full_name":"Kerber, Michael","last_name":"Kerber","first_name":"Michael","orcid":"0000-0002-8030-9299"},{"full_name":"Sagraloff, Michael","last_name":"Sagraloff","first_name":"Michael"}],"external_id":{"arxiv":["1104.1362"]},"status":"public","date_created":"2018-12-11T12:02:43Z","department":[{"_id":"HeEd"}],"day":"08","publisher":"Springer","article_processing_charge":"No","year":"2011","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","month":"06","date_published":"2011-06-08T00:00:00Z","citation":{"mla":"Kerber, Michael, and Michael Sagraloff. <i>Root Refinement for Real Polynomials</i>. Springer, 2011, pp. 209–16, doi:<a href=\"https://doi.org/10.1145/1993886.1993920\">10.1145/1993886.1993920</a>.","short":"M. Kerber, M. Sagraloff, in:, Springer, 2011, pp. 209–216.","ieee":"M. Kerber and M. Sagraloff, “Root refinement for real polynomials,” presented at the ISSAC: International Symposium on Symbolic and Algebraic Computation, California, USA, 2011, pp. 209–216.","ama":"Kerber M, Sagraloff M. Root refinement for real polynomials. In: Springer; 2011:209-216. doi:<a href=\"https://doi.org/10.1145/1993886.1993920\">10.1145/1993886.1993920</a>","chicago":"Kerber, Michael, and Michael Sagraloff. “Root Refinement for Real Polynomials,” 209–16. Springer, 2011. <a href=\"https://doi.org/10.1145/1993886.1993920\">https://doi.org/10.1145/1993886.1993920</a>.","ista":"Kerber M, Sagraloff M. 2011. Root refinement for real polynomials. ISSAC: International Symposium on Symbolic and Algebraic Computation, 209–216.","apa":"Kerber, M., &#38; Sagraloff, M. (2011). Root refinement for real polynomials (pp. 209–216). Presented at the ISSAC: International Symposium on Symbolic and Algebraic Computation, California, USA: Springer. <a href=\"https://doi.org/10.1145/1993886.1993920\">https://doi.org/10.1145/1993886.1993920</a>"},"main_file_link":[{"url":"http://arxiv.org/abs/1104.1362","open_access":"1"}],"quality_controlled":"1","title":"Root refinement for real polynomials"}