From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/4594 Path: news.gmane.org!not-for-mail From: Michael Barr Newsgroups: gmane.science.mathematics.categories Subject: Re: Bourbaki and Categories Date: Tue, 16 Sep 2008 10:47:27 -0400 (EDT) Message-ID: NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Trace: ger.gmane.org 1241020047 13977 80.91.229.2 (29 Apr 2009 15:47:27 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 29 Apr 2009 15:47:27 +0000 (UTC) To: categories@mta.ca Original-X-From: rrosebru@mta.ca Tue Sep 16 21:25:01 2008 -0300 Return-path: Envelope-to: categories-list@mta.ca Delivery-date: Tue, 16 Sep 2008 21:25:01 -0300 Original-Received: from Majordom by mailserv.mta.ca with local (Exim 4.61) (envelope-from ) id 1Kfkl4-0004gc-9r for categories-list@mta.ca; Tue, 16 Sep 2008 21:19:02 -0300 Original-Sender: cat-dist@mta.ca Precedence: bulk X-Keywords: X-UID: 64 Original-Lines: 8 Xref: news.gmane.org gmane.science.mathematics.categories:4594 Archived-At: Still, it might be interesting and even instructive to try to build a sketch whose objects are (interpreted as) sets of points sets of lines, sets of circles and intersection is an operation. I guess incidence would have to be a relation. It might work. Michael