From: Paul Taylor <pt@dcs.qmw.ac.uk>
To: categories@mta.ca
Subject: Re: Skeleton of a category
Date: Mon, 20 Sep 1999 18:44:56 +0100 (BST) [thread overview]
Message-ID: <199909201744.SAA04812@wax.dcs.qmw.ac.uk> (raw)
> Would you let me know when the category has an equivalent skeleton?
"every small category has a skeleton" iff the axiom of choice holds.
See Exercise 3.26 in my book, or
http://www.dcs.qmw.ac.uk/~pt/book/html/s3e.html#e3.26
for a preorder example.
Exercise 4.37 defines "skeletal"
http://www.dcs.qmw.ac.uk/~pt/book/html/s4e.html#e4.37
Paul
next reply other threads:[~1999-09-20 17:44 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-09-20 17:44 Paul Taylor [this message]
-- strict thread matches above, loose matches on Subject: below --
1999-09-20 17:06 Hongseok Yang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=199909201744.SAA04812@wax.dcs.qmw.ac.uk \
--to=pt@dcs.qmw.ac.uk \
--cc=categories@mta.ca \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).