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math.LO2025
Automorphism groups of non-Archimedean groups
Andre Nies, Philipp Schlicht
Let $\Aut(G)$ denote the group of (bi-)continuous automorphisms %and $\Out(G)$ the outer automorphism group of a non-Archimedean Polish group~. We show that for any such wit…
math.GR2025
Fractal dimensions and profinite groups
Elvira Mayordomo, Andre Nies
Let be a finitely branching rooted tree such that any node has at least two successors. The path space is an ultrametric space: for distinct paths let $d(f,g)= 1/|T…