2 papers
math.GR2023
Non-split sharply 2-transitive groups of odd positive characteristic
Marco Amelio, Simon André, Katrin Tent
It is well-known that every sharply 2-transitive group of characteristic 3 splits. Here we construct the first examples of non-split sharply 2-transitive groups in odd positive cha…
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…