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From: Colin McLarty <colin.mclarty@case.edu>
To: categories@mta.ca
Subject: Terminology of locally small categories without replacement
Date: Wed, 1 Dec 2010 17:00:51 -0500	[thread overview]
Message-ID: <E1PNxgk-0002Ex-JK@mlist.mta.ca> (raw)

Locally small categories are always defined as categories such that:

LS) for any objects A,B there is a set of all arrows A-->B.

When the base set theory includes the axiom scheme of replacement that
is equivalent to a prima facie stronger property:

??) for any set of objects there is a set of all arrows between them.

These two are not equivalent in the absence of the axiom scheme of
replacement.  There the second is much stronger, but it remains
important.  Is there a good term for it?

thanks, Colin


[For admin and other information see: http://www.mta.ca/~cat-dist/ ]


             reply	other threads:[~2010-12-01 22:00 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-01 22:00 Colin McLarty [this message]
2010-12-02 14:01 ` Vaughan Pratt
2010-12-02 15:18 ` F. William Lawvere
2010-12-03  4:15   ` Michael Shulman
     [not found] ` <E1PPwy9-0005H4-66@mlist.mta.ca>
2010-12-07 22:22   ` Richard Garner
     [not found]   ` <AANLkTi=N5Xdqz9FWKfy+n7cBmxvyxbeSxHNizHapQF_P@mail.gmail.com>
2010-12-08  0:11     ` JeanBenabou
     [not found] ` <3280C591-6F02-454A-A1A4-FA8AC7FD0086@wanadoo.fr>
2010-12-08  0:48   ` Richard Garner
     [not found] ` <E1PP22t-0001sv-8p@mlist.mta.ca>
     [not found]   ` <CC4A04DE-195B-4BDC-994F-5D40D00EAE44@wanadoo.fr>
2010-12-09 23:53     ` Ross Street

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