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math.GT2022
Every countable compact subset of is tame
Agelos Georgakopoulos
We prove that any two countable, compact, subsets of that are homeomorphic also have homeomorphic complements. Thus any wild subspace like the classical con…
math.GT2022
Discrete group actions on 3-manifolds and embeddable Cayley complexes
Agelos Georgakopoulos, George Kontogeorgiou
We prove that a group admits a discrete topological (equivalently, smooth) action on some simply-connected 3-manifold if and only if has a Cayley complex embeddable -- with…