most recent 30 from http://mathoverflow.net 2013-05-20T06:24:49Z http://mathoverflow.net/feeds/question/41843 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/41843/central-extensions-of-automorphisms-of-bruhat-tits-trees Hadi 2010-10-11T23:22:03Z 2010-10-11T23:22:03Z

<p>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:</p> <p>Does the group of automorphisms of a Bruhat-Tits tree have nontrivial central extensions?</p>