Fixed Subgroups of Endomorphisms of Free Products
Sykiotis, Mihalis
Original · EN
Let G=ᵢ₌₁ⁿGᵢ and let ϕ be a symmetric endomorphism of G. If ϕ is a monomorphism or if G is a finitely generated residually finite group, then the fixed subgroup Fix(ϕ)={g∈ G:ϕ(g)=g} of ϕ has Kurosh rank at most n.
English translation
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