Fixed points and stable images of endomorphisms for the free group of rank two
published by Alan Logan
in 2020
and research's language is
English
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Abstract in English
We give an algorithm which computes the fixed subgroup and the stable image for any endomorphism of the free group of rank two $F_2$, answering for $F_2$ a question posed by Stallings in 1984 and a question of Ventura.