From: David Roberts <david.roberts@adelaide.edu.au>
To: "categories@mta.ca list" <categories@mta.ca>
Subject: Re: Reference requested
Date: Fri, 30 Sep 2011 17:08:06 +0930 [thread overview]
Message-ID: <E1R9iGF-0002BN-5r@mlist.mta.ca> (raw)
In-Reply-To: <E1R92mj-0001a9-J1@mlist.mta.ca>
Or codiscrete groupoid?
David
On 29 September 2011 23:11, Ronnie Brown
<ronnie.profbrown@btinternet.com> wrote:
> Why not use the term `indiscrete groupoid' for the functor that gives a
> right adjoint to the functor Ob: Groupoids \to Sets? The left adjoint
> is then of course the `discrete groupoid'. This agrees with the
> terminology for discrete and indiscrete topologies.
>
> I confess to have used different terminology in various places.
>
> Of course one use of these notions is to show that the functor Ob
> preserves limits and colimits, which is a start on constructing them.
...
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next prev parent reply other threads:[~2011-09-30 7:38 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-28 20:34 partial categories Emily Riehl
[not found] ` <CADxNEA2=AdiLetth8HkP0LK2Y8chP0kfrTjyQ5bP1OTA3h5Fig@mail.gmail.com>
2011-09-29 1:11 ` Claudio Hermida
2011-09-29 1:35 ` Reference requested Peter May
2011-09-29 13:41 ` Ronnie Brown
2011-09-30 7:34 ` jpradines
[not found] ` <11E807BD-8A2D-423D-8D1B-117BC99B7CF8@mq.edu.au>
2011-09-30 13:56 ` Peter May
2011-09-29 2:18 ` partial categories Peter Selinger
2011-09-29 12:24 ` Lutz Schröder
2011-09-30 7:38 ` David Roberts [this message]
2011-09-30 18:47 Reference requested F William Lawvere
2011-09-30 21:19 Fred E.J. Linton
2011-10-02 14:48 ` jpradines
2011-09-30 22:31 F William Lawvere
2011-10-01 17:46 Fred E.J. Linton
2011-10-03 6:06 Fred E.J. Linton
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