Enric Ventura

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math.GR2009★ 2 cited

The twisted conjugacy problem for pairs of endomorphisms in nilpotent groups

V. Roman'kov, E. Ventura

An algorithm is constructed that, when given an explicit presentation of a finitely generated nilpotent group $G,$ decides for any pair of endomorphisms $φ, ψ : G \to G$ and any pai…

math.GR2009

Computing fixed closures in free groups

Enric Ventura

Let $F$ be a finitely generated free group. We present an algorithm such that, given a subgroup $H ⩽ F$ , decides whether $H$ is the fixed subgroup of some family of automorp…