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Questions about the branch of algebra that deals with groups.

2 votes

Property (T) and subgroups of finite index

Since $H$ contains a subgroup of finite index which is normal in $G$, what you are asking also follows from Theorem 1.7.1 of the book of Bekka, de la Harpe and Valette (mentioned in Jon Bannon's comme …
Hadi's user avatar
  • 741
6 votes
0 answers
288 views

Central extensions of automorphisms of Bruhat-Tits trees

This is the first time I am using Mathoverflow and I am still learning how to use it. That is why I want to begin with a curious question: Does the group of automorphisms of a Bruhat-Tits tree have n …
Hadi's user avatar
  • 741