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math.GR2021
Bass-Serre theory for groupoids
Giulia dal Verme, Thomas Weigel
In this paper a Bass-Serre theory in the groupoid setting is developed and a structure theorem is established. Any groupoid action without inversion of edges on a forest induces a…
math.GR2021★ 6 cited
Oriented pro- groups with the Bogomolov-Positselski property
Claudio Quadrelli, Thomas S. Weigel
For a prime number we say that an oriented pro- group has the Bogomolov-Positselski property if the kernel of the canonical projection on its maximal -abeli…