From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/4150 Path: news.gmane.org!not-for-mail From: Toby Bartels Newsgroups: gmane.science.mathematics.categories Subject: Re: Cartesian closed without products Date: Mon, 7 Jan 2008 13:35:11 -0800 Message-ID: NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1241019754 11938 80.91.229.2 (29 Apr 2009 15:42:34 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 29 Apr 2009 15:42:34 +0000 (UTC) To: categories@mta.ca Original-X-From: rrosebru@mta.ca Tue Jan 8 14:24:59 2008 -0400 Return-path: Envelope-to: categories-list@mta.ca Delivery-date: Tue, 08 Jan 2008 14:24:59 -0400 Original-Received: from Majordom by mailserv.mta.ca with local (Exim 4.61) (envelope-from ) id 1JCJ0o-0005w1-Sb for categories-list@mta.ca; Tue, 08 Jan 2008 14:17:19 -0400 Content-Disposition: inline Original-Sender: cat-dist@mta.ca Precedence: bulk X-Keywords: X-UID: 11 Original-Lines: 20 Xref: news.gmane.org gmane.science.mathematics.categories:4150 Archived-At: Richard Garner wrote: >On reflection, [...] >EK-closed requires the unit object to be representable as >well. This is a reasonable requirement anyway, since the unit is the 0fold iterated hom, just as it's the 0fold iterated product. So if you think should be accompanied by , then so should . OTOH, the version without unit probably has some use, just as non-monoid semigroups occasionally do. --Toby