From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/6085 Path: news.gmane.org!not-for-mail From: John Baez Newsgroups: gmane.science.mathematics.categories Subject: Re: Another question on Grothendieck Date: Tue, 31 Aug 2010 13:50:06 +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 1283299593 7853 80.91.229.12 (1 Sep 2010 00:06:33 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Wed, 1 Sep 2010 00:06:33 +0000 (UTC) Cc: Categories list Original-X-From: majordomo@mlist.mta.ca Wed Sep 01 02:06:30 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 1OqaqN-00082Z-I5 for gsmc-categories@m.gmane.org; Wed, 01 Sep 2010 02:06:23 +0200 Original-Received: from mlist.mta.ca ([138.73.1.63]:43948) by smtpy.mta.ca with esmtp (Exim 4.71) (envelope-from ) id 1Oqanp-0006J8-H3; Tue, 31 Aug 2010 21:03:45 -0300 Original-Received: from majordomo by mlist.mta.ca with local (Exim 4.71) (envelope-from ) id 1Oqanm-0004q0-60 for categories-list@mlist.mta.ca; Tue, 31 Aug 2010 21:03:42 -0300 In-Reply-To: Precedence: bulk Xref: news.gmane.org gmane.science.mathematics.categories:6085 Archived-At: Hi - Grothendieck introduces, on the top of p. 209 of the Tohoku paper, the > notation U_{i_0..i_p} without explanation and uses it again over the next > couple pages. Here {U_i} is an open cover of a space X and I have reason > to believe that this stands for the intersection of U_{i_j}. Can anyone > confirm this? > That's certainly what everyone uses this notation for nowadays, so it sounds like a very good guess. Best, jb [For admin and other information see: http://www.mta.ca/~cat-dist/ ]