From: Michael Barr <barr@barrs.org>
To: Categories list <categories@mta.ca>
Subject: My posting
Date: Sat, 12 Feb 2000 19:20:46 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.10.10002121916250.25609-100000@triples.math.mcgill.ca> (raw)
>From Todd Wilson, I learned that adding identities is not so harmless.
So suppose only that there are objects, arrows, source and target and
arrows that compose associatively only when source matches target. With
identities, you can conclude, for any idempotent e, from eee = e1e, that e
= 1 and that makes it trivial.
Michael
next reply other threads:[~2000-02-13 0:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-02-13 0:20 Michael Barr [this message]
-- strict thread matches above, loose matches on Subject: below --
1998-04-06 19:07 Michael Barr
1997-08-01 17:48 categories
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