On the complexity of the Whitehead minimization problem
Roig, Abdó
Ventura, Enric
Weil, Pascal
Centre de Recerca Matemàtica

Imprint: Centre de Recerca Matemàtica 2006
Description: 29 p.
Abstract: The Whitehead minimization problem consists in finding a minimum size element in the automorphic orbit of a word, a cyclic word or a finitely generated subgroup in a finite rank free group. We give the first fully polynomial algorithm to solve this problem, that is, an algorithm that is polynomial both in the length of the input word and in the rank of the free group. Earlier algorithms had an exponential dependency in the rank of the free group. It follows that the primitivity problem - to decide whether a word is an element of some basis of the free group - and the free factor problem can also be solved in polynomial time.
Rights: Aquest document està subjecte a una llicència d'ús de Creative Commons, amb la qual es permet copiar, distribuir i comunicar públicament l'obra sempre que se'n citin l'autor original, la universitat i el centre i no se'n faci cap ús comercial ni obra derivada, tal com queda estipulat en la llicència d'ús Creative Commons
Language: Anglès
Series: Centre de Recerca Matemàtica. Prepublicacions
Series: Prepublicacions del Centre de Recerca Matemàtica ; 721
Document: Article ; Prepublicació ; Versió de l'autor
Subject: Integrals singulars



29 p, 251.5 KB

The record appears in these collections:
Research literature > Preprints

 Record created 2009-07-13, last modified 2023-02-11



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