Showing 2022 · math.GRShow all
2 papers · 2 filters
math.GR2022
Positive definite maps on amenable groups, II
Mikaël Pichot, Erik Séguin
We introduce an Ulam-type stability condition for positive definite maps defined on a countable group and prove that this condition characterizes amenability.
math.GR2022
Root distributions in Moebius-Kantor complexes
Sylvain Barré, Mikaël Pichot
We study the distribution of roots of rank 2 in nonpositively curved 2-complexes with Moebius--Kantor links. For every face in such a complex, the parity of the number of roots of…