From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/4552 Path: news.gmane.org!not-for-mail From: tholen@mathstat.yorku.ca Newsgroups: gmane.science.mathematics.categories Subject: Re: Categories and functors, query Date: Mon, 8 Sep 2008 20:55:48 -0400 Message-ID: NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain;charset=ISO-8859-1;format="flowed" Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1241020021 13815 80.91.229.2 (29 Apr 2009 15:47:01 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 29 Apr 2009 15:47:01 +0000 (UTC) To: categories@mta.ca Original-X-From: rrosebru@mta.ca Mon Sep 8 22:47:47 2008 -0300 Return-path: Envelope-to: categories-list@mta.ca Delivery-date: Mon, 08 Sep 2008 22:47:47 -0300 Original-Received: from Majordom by mailserv.mta.ca with local (Exim 4.61) (envelope-from ) id 1KcsEy-0000He-Gp for categories-list@mta.ca; Mon, 08 Sep 2008 22:42:00 -0300 Content-Disposition: inline Original-Sender: cat-dist@mta.ca Precedence: bulk X-Keywords: X-UID: 22 Original-Lines: 10 Xref: news.gmane.org gmane.science.mathematics.categories:4552 Archived-At: Quoting Walter Tholen : > definition was arrived at without having to leave the universe. With the > definition of category (and functor and natural transformation) > Eilenberg and Moore had to do a lot more than just repeating at the > monoid level what Brandt did at the group level! In my view their big OOPS -- "Moore" should read "Mac Lane", of course. (Sorry, Saunders!) W.