From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/6247 Path: news.gmane.org!not-for-mail From: John Baez Newsgroups: gmane.science.mathematics.categories Subject: RE : Re: Not invariant but good Date: Tue, 28 Sep 2010 10:10:48 +0800 Message-ID: References: Reply-To: John Baez NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: dough.gmane.org 1285720479 16192 80.91.229.12 (29 Sep 2010 00:34:39 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Wed, 29 Sep 2010 00:34:39 +0000 (UTC) To: categories Original-X-From: majordomo@mlist.mta.ca Wed Sep 29 02:34:38 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 1P0kd3-0003hJ-P5 for gsmc-categories@m.gmane.org; Wed, 29 Sep 2010 02:34:37 +0200 Original-Received: from mlist.mta.ca ([138.73.1.63]:32972) by smtpy.mta.ca with esmtp (Exim 4.71) (envelope-from ) id 1P0kcF-0000f5-2s; Tue, 28 Sep 2010 21:33:47 -0300 Original-Received: from majordomo by mlist.mta.ca with local (Exim 4.71) (envelope-from ) id 1P0kcB-000424-8i for categories-list@mlist.mta.ca; Tue, 28 Sep 2010 21:33:43 -0300 In-Reply-To: Precedence: bulk Xref: news.gmane.org gmane.science.mathematics.categories:6247 Archived-At: Andre wrote: >I guess you have introduced the "evil" terminology >because you wanted people to pay attention to >the fact that certain constructions in category theory >and higher category theory are not invariant under >equivalences. If this is so, you have succeeded in your goal. Good! But I never really thought of it as a piece of "terminology" that I "introduced". I've never used in any published paper, for example. I've always thought of it as a JOKE. In the future I'll try to avoid telling this joke in the presence of people who find it upsetting. This should be easy, because I'm not working on pure math anymore, except for a few projects that I'm trying to finish up. I'm working on environmental issues. The planet is headed for an ecological disaster within this century. We cannot prevent it, we can only minimize the damage. I hope some people on the category theory mailing list can help out here: http://www.azimuthproject.org/azimuth/show/Azimuth+Project If you aren't sure how to help, send me an email. Best, jb [For admin and other information see: http://www.mta.ca/~cat-dist/ ]