From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/6110 Path: news.gmane.org!not-for-mail From: Aleks Kissinger Newsgroups: gmane.science.mathematics.categories Subject: Re: Dual category and dual object Date: Sat, 4 Sep 2010 14:41:24 -0500 Message-ID: References: Reply-To: Aleks Kissinger NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 X-Trace: dough.gmane.org 1283646244 19228 80.91.229.12 (5 Sep 2010 00:24:04 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Sun, 5 Sep 2010 00:24:04 +0000 (UTC) Cc: categories To: David Leduc Original-X-From: majordomo@mlist.mta.ca Sun Sep 05 02:24:03 2010 Return-path: Envelope-to: gsmc-categories@m.gmane.org Original-Received: from smtpx.mta.ca ([138.73.1.138]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Os31b-0002nb-Vj for gsmc-categories@m.gmane.org; Sun, 05 Sep 2010 02:24:00 +0200 Original-Received: from mlist.mta.ca ([138.73.1.63]:52562) by smtpx.mta.ca with esmtp (Exim 4.71) (envelope-from ) id 1Os30Y-0001RJ-Ev; Sat, 04 Sep 2010 21:22:54 -0300 Original-Received: from majordomo by mlist.mta.ca with local (Exim 4.71) (envelope-from ) id 1Os30W-0006ii-72 for categories-list@mlist.mta.ca; Sat, 04 Sep 2010 21:22:52 -0300 In-Reply-To: Precedence: bulk Xref: news.gmane.org gmane.science.mathematics.categories:6110 Archived-At: In the (bi)category Prof of categories and profunctors, the dual of an object is the dual category. Profunctors most certainly came later than the notions of categorical dual and dual objects (or at least their concrete counterparts, dual spaces), so this might just be a happy coincidence. Aleks On Sat, Sep 4, 2010 at 5:46 AM, David Leduc wrote: > Are the notions of dual category and dual object related? > If not, are there any good reasons to use the word "dual" for both notions? > > [For admin and other information see: http://www.mta.ca/~cat-dist/ ]