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From: Michael Barr <barr@math.mcgill.ca>
To: Toby Bartels <toby+categories@ugcs.caltech.edu>
Cc: categories <categories@mta.ca>,
	David Leduc <david.leduc6@googlemail.com>
Subject: Re: Dual category and dual object
Date: Sat, 4 Sep 2010 20:47:20 -0400 (EDT)	[thread overview]
Message-ID: <E1OsHL4-0005NL-2t@mlist.mta.ca> (raw)
In-Reply-To: <E1Os2xN-0006du-CT@mlist.mta.ca>

On Sat, 4 Sep 2010, Toby Bartels wrote:

> David Leduc wrote:
>
>> Are the notions of dual category and dual object related?

>.......................................................
>
> On the other hand, we can say "opposite category" instead of "dual category",
> especially since we denote the dual category of C by C^{op}.
>

So you would say that complete atomic boolean algebras is just Set^{op}?
Well I wouldn't.  They are, of course, equivalent, but not the same.



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  reply	other threads:[~2010-09-05  0:47 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-04 10:46 David Leduc
2010-09-04 14:46 ` Michael Barr
2010-09-04 16:38 ` Toby Bartels
2010-09-05  0:47   ` Michael Barr [this message]
     [not found]   ` <Pine.LNX.4.64.1009042045000.20602@msr03.math.mcgill.ca>
2010-09-05  0:54     ` Toby Bartels
2010-09-04 19:41 ` Aleks Kissinger
     [not found] ` <3E056346-48EE-4D5C-A2FD-8008A722583A@mq.edu.au>
2010-09-05  1:50   ` David Leduc
     [not found] ` <AANLkTikBACfX_x3DX2pUL6zSGc_5xYoz42q3Gbf3Hpby@mail.gmail.com>
2010-09-05  2:30   ` Aleks Kissinger

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