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On the profinite rigidity of triangle groups (2004.07137v1)
Published 15 Apr 2020 in math.GR, math.GT, and math.NT
Abstract: We prove that certain Fuchsian triangle groups are profinitely rigid in the absolute sense, i.e. each is distinguished from all other finitely generated, residually finite groups by its set of finite quotients. We also develop a method based on character varieties that can be used to distinguish between the profinite completions of certain groups.
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