From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/8755 Path: news.gmane.org!not-for-mail From: Uwe Egbert Wolter Newsgroups: gmane.science.mathematics.categories Subject: Variable sets Date: Mon, 07 Dec 2015 14:37:38 +0100 Message-ID: Reply-To: Uwe Egbert Wolter NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1449495963 4053 80.91.229.3 (7 Dec 2015 13:46:03 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 7 Dec 2015 13:46:03 +0000 (UTC) To: categories@mta.ca Original-X-From: majordomo@mlist.mta.ca Mon Dec 07 14:45:56 2015 Return-path: Envelope-to: gsmc-categories@m.gmane.org Original-Received: from smtp3.mta.ca ([138.73.7.22]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1a5w70-0002p4-CV for gsmc-categories@m.gmane.org; Mon, 07 Dec 2015 14:45:54 +0100 Original-Received: from mlist.mta.ca ([138.73.1.63]:43246) by smtp3.mta.ca with esmtp (Exim 4.80) (envelope-from ) id 1a5w6Q-0007Jn-8k; Mon, 07 Dec 2015 09:45:18 -0400 Original-Received: from majordomo by mlist.mta.ca with local (Exim 4.71) (envelope-from ) id 1a5w6O-0004Q0-BM for categories-list@mlist.mta.ca; Mon, 07 Dec 2015 09:45:16 -0400 Precedence: bulk Xref: news.gmane.org gmane.science.mathematics.categories:8755 Archived-At: Dear all, in the paper "Variable set theory" from Barr/McLarty/Wells we find a sketchy description of an example "the set of businesses". I wonder if this example is described somewhere in more detail and if there are other examples of "common usage" somewhere in the literature that may be even approachable by non-mathematicians? Can somebody supply a copy of "Variable Quantities and Variable Structures in Topoi" from F. WILLIAM LAWVERE? Best regards Uwe Wolter [For admin and other information see: http://www.mta.ca/~cat-dist/ ]