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math.GR2021
Co-Hopfian virtually free groups and elementary equivalence
Simon André
We prove that two co-Hopfian finitely generated virtually free groups are elementarily equivalent if and only if they are isomorphic. We also prove that co-Hopfian finitely generat…
math.GR2021
Simple sharply 2-transitive groups
Simon André, Katrin Tent
We construct simple sharply 2-transitive groups. Our result answers an open question of Peter Neumann. In fact, we prove that every sharply 2-transitive group of characteristic 0 e…