From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/7950 Path: news.gmane.org!not-for-mail From: Michael Barr Newsgroups: gmane.science.mathematics.categories Subject: Paper on variable set theory Date: Sat, 14 Dec 2013 16:59:34 -0500 (EST) Message-ID: Reply-To: Michael Barr NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII X-Trace: ger.gmane.org 1387069624 17369 80.91.229.3 (15 Dec 2013 01:07:04 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 15 Dec 2013 01:07:04 +0000 (UTC) To: Categories list Original-X-From: majordomo@mlist.mta.ca Sun Dec 15 02:07:11 2013 Return-path: Envelope-to: gsmc-categories@m.gmane.org Original-Received: from smtp3.mta.ca ([138.73.1.186]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Vs0Ap-0007Xm-Cj for gsmc-categories@m.gmane.org; Sun, 15 Dec 2013 02:07:11 +0100 Original-Received: from mlist.mta.ca ([138.73.1.63]:52680) by smtp3.mta.ca with esmtp (Exim 4.80) (envelope-from ) id 1Vs09D-0004uQ-LJ; Sat, 14 Dec 2013 21:05:31 -0400 Original-Received: from majordomo by mlist.mta.ca with local (Exim 4.71) (envelope-from ) id 1Vs09E-0003Gh-Jt for categories-list@mlist.mta.ca; Sat, 14 Dec 2013 21:05:32 -0400 Precedence: bulk Xref: news.gmane.org gmane.science.mathematics.categories:7950 Archived-At: Around 1986, Colin McLarty, Charles Wells, and I noticed that Scientific American had recently published a few articles on subjects mathematical and decided to try to write one on variable set theory, AKA topos theory. Unfortunately, that particular window at Sci Am quickly closed. Our article was turned down and we forgot about it. More recently, I decided it might be interesting, or at least amusing to throw it open to the categorical community. The result can be found at ftp://ftp.math.mcgill.ca/barr/pdffiles/vst.pdf Michael -- Every gun that is made, every warship launched, every rocket fired signifies, in the final sense, a theft from those who hunger and are not fed, those who are cold and are not clothed. -Dwight D. Eisenhower [For admin and other information see: http://www.mta.ca/~cat-dist/ ]