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math.GR2021
Hall's universal group is a subgroup of the abstract commensurator of a free group
Edgar A. Bering, Daniel Studenmund
P. Hall constructed a universal countable locally finite group U, determined up to isomorphism by two properties: every finite group C is a subgroup of U, and every embedding of C…
math.GR2021
Topological Models of Abstract Commensurators
Edgar A. Bering, Daniel Studenmund
The full solenoid over a topological space is the inverse limit of all finite covers. When is a compact Hausdorff space admitting a locally path connected universal cover,…