From: FEJ Linton <FLinton@Wesleyan.edu>
To: categories@mta.ca
Subject: Re: The Idea of Structure as Data and Conditions
Date: Mon, 28 May 2012 02:00:12 -0400 [thread overview]
Message-ID: <E1SZ8q4-0004H2-2Y@mlist.mta.ca> (raw)
In-Reply-To: <alpine.LRH.2.02.1205261942060.32490@msr03.math.mcgill.ca>
On Sat, 26 May 2012 19:48:26 -0400 (EDT), Michael Barr wrote:
> Let me point out that not every structure comes with an obvious notion of
> morphism. --- [examples snipped] ---
The most common example: sets. The structure is based on membership.
Virtually no one ever wants to restrict attention to functions that respect
(preserve or reflect) membership (other than "preserve" between ordinals).
Cheers, -- Fred
[For admin and other information see: http://www.mta.ca/~cat-dist/ ]
next prev parent reply other threads:[~2012-05-28 6:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-25 22:09 Ellis D. Cooper
2012-05-26 23:48 ` Michael Barr
2012-05-27 18:16 ` Eduardo J. Dubuc
2012-05-28 6:00 ` FEJ Linton [this message]
2012-05-29 13:28 ` Staffan Angere
2012-05-30 6:26 ` Vaughan Pratt
2012-05-27 13:02 ` Charles Wells
[not found] ` <CABZOOqZ54NtG1n3K4f8o6mMRSgZ_2yVjE6S+-UWkQSO_PXi1tQ@mail.gmail.com>
2012-05-27 13:06 ` Charles Wells
2012-05-27 23:25 ` Vaughan Pratt
2012-05-29 3:15 Fred E.J. Linton
2012-05-29 13:28 ` Colin McLarty
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