21 Jun
2012
21 Jun
'12
5:54 p.m.
On Thu, Jun 21, 2012 at 6:34 AM, Michael Barr <barr@math.mcgill.ca> wrote:
Somewhere I have seen a proof that all monics in the category of groups are regular. I think it was in a paper by Eilenberg and ??? and it needed a special argument if there were elements of order 2. Can someone help me find this?
I don't know the original reference, but this is exercise 7H in The Joy of Cats, which contains a substantial hint for a proof (not involving a special case for order-2 elements, so maybe it is a different proof). [For admin and other information see: http://www.mta.ca/~cat-dist/ ]