From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/6282 Path: news.gmane.org!not-for-mail From: Vaughan Pratt Newsgroups: gmane.science.mathematics.categories Subject: Re: potential names Date: Mon, 04 Oct 2010 00:20:18 -0700 Message-ID: References: Reply-To: Vaughan Pratt NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1286194320 25892 80.91.229.12 (4 Oct 2010 12:12:00 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Mon, 4 Oct 2010 12:12:00 +0000 (UTC) To: Categories list Original-X-From: majordomo@mlist.mta.ca Mon Oct 04 14:11:59 2010 Return-path: Envelope-to: gsmc-categories@m.gmane.org Original-Received: from smtpy.mta.ca ([138.73.1.139]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1P2jte-00011G-F1 for gsmc-categories@m.gmane.org; Mon, 04 Oct 2010 14:11:58 +0200 Original-Received: from mlist.mta.ca ([138.73.1.63]:34039) by smtpy.mta.ca with esmtp (Exim 4.71) (envelope-from ) id 1P2jso-0005EQ-0Q; Mon, 04 Oct 2010 09:11:06 -0300 Original-Received: from majordomo by mlist.mta.ca with local (Exim 4.71) (envelope-from ) id 1P2jsl-0001l6-39 for categories-list@mlist.mta.ca; Mon, 04 Oct 2010 09:11:03 -0300 In-Reply-To: Precedence: bulk Xref: news.gmane.org gmane.science.mathematics.categories:6282 Archived-At: On 10/2/2010 10:43 AM, Paul Taylor wrote: > So my suggestion is that you play around with skeletons, bones > or even the Grim Reaper for something more suitable. Along those lines, how about "scythe" for the functor [-,1+1]: C^op --> C? In a Boolean topos this is just the (internal) contravariant power object functor, but more generally it tends to cleave objects into their connected components in a suitable sense. Vaughan [For admin and other information see: http://www.mta.ca/~cat-dist/ ]