3 Feb
2011
3 Feb
'11
12:10 p.m.
I apologise for cluttering the list up further, but I misunderstood your second question, so my answer wasn't quite right. The objects you asked about can be analysed in terms of categories with a designated collection of invertible endomorphisms. Nathan [For admin and other information see: http://www.mta.ca/~cat-dist/ ]