mathoverflow.net is an independent Stack Exchange 1.0 site on an old fork of the engine; math.stackexchange.com is a fully qualified Stack Exchange 2.0 peer sit

mathoverflow.net is an independent Stack Exchange 1.0 site on an old fork of the engine; math.stackexchange.com is a fully qualified Stack Exchange 2.0 peer site on the current rev of the engine. see: http://blog.stackoverflow.com/2010/04/changes-to-stack-exchange/ http://blog.stackoverflow.com/2010/04/changes-to-stack-excha...