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math.GR2006
Algebraic extensions in free groups
Alexei Miasnikov, Enric Ventura, Pascal Weil
The aim of this paper is to unify the points of view of three recent and independent papers (Ventura 1997, Margolis, Sapir and Weil 2001 and Kapovich and Miasnikov 2002), where sim…
math.GR2006
On an algorithm to decide whether a free group is a free factor of another
Pedro Silva, Pascal Weil
We revisit the problem of deciding whether a finitely generated subgroup H is a free factor of a given free group F. Known algorithms solve this problem in time polynomial in the s…