Categorists, On Sat, Apr 29, 2006 at 01:27:20PM +0930, David Roberts wrote:
Dear all,
after a bit of searching, I cannot find much in the literature about gr- stacks, more specifically, charts and presentations thereof reflecting (in a non-technical sense) the group-like structure. Also, aside from self equivalences of gerbes and quotients of groups **(G/H for non-normal H)**, I cannot dream up other "interesting" examples - and these are the opposite ends of the spectrum I want to consider.
A bit of confusion occured when I tried to post a corrected version of the above (all due to myself), so here goes. I retract the statement in ** ** above - what I meant was G/H with a badly behaved topological/differentiable quotient (H normal in G) and I was after examples not connected with gerbes/crossed modules but something more `interesting' than group quotients. Thanks, -- David Roberts Pure Mathematics University of Adelaide South Australia, 5005 You know we all became mathematicians for the same reason: we were lazy. -Max Rosenlicht(1949)