Polynomial-time complexity for instances of the endomorphism problem in free groups
Ciobanu, Laura
Centre de Recerca Matemàtica

Imprint: Centre de Recerca Matemàtica 2005
Abstract: We say the endomorphism problem is solvable for an element W in a free group F if it can be decided effectively whether, given U in F, there is an endomorphism Φ of F sending W to U. This work analyzes an approach due to C. Edmunds and improved by C. Sims. Here we prove that the approach provides an efficient algorithm for solving the endomorphism problem when W is a two- generator word. We show that when W is a two-generator word this algorithm solves the problem in time polynomial in the length of U. This result gives a polynomial-time algorithm for solving, in free groups, two-variable equations in which all the variables occur on one side of the equality and all the constants on the other side.
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 ; 655
Document: Article ; Prepublicació ; Versió de l'autor
Subject: Grups lliures ; Endomorfismes (Teoria de grups)



44 p, 348.8 KB

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Research literature > Preprints

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



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