From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/3665 Path: news.gmane.org!not-for-mail From: "Fred E.J. Linton" Newsgroups: gmane.science.mathematics.categories Subject: Re: pullback ... Date: Tue, 06 Mar 2007 21:09:33 -0500 Message-ID: NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1241019443 9688 80.91.229.2 (29 Apr 2009 15:37:23 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 29 Apr 2009 15:37:23 +0000 (UTC) To: Original-X-From: rrosebru@mta.ca Wed Mar 7 13:54:29 2007 -0400 Return-path: Envelope-to: categories-list@mta.ca Delivery-date: Wed, 07 Mar 2007 13:54:29 -0400 Original-Received: from Majordom by mailserv.mta.ca with local (Exim 4.61) (envelope-from ) id 1HP0FT-0001IY-6y for categories-list@mta.ca; Wed, 07 Mar 2007 13:48:23 -0400 Original-Sender: cat-dist@mta.ca Precedence: bulk X-Keywords: X-UID: 19 Original-Lines: 34 Xref: news.gmane.org gmane.science.mathematics.categories:3665 Archived-At: Greetings! As regards Peter Johnstone's query, = = > ... does anyone out there know who invented the > terms "pullback" and "pushout"? ..., while I can't speak directly to the question of who invented those = terms, I do recall that, in the late '50s already, fiber bundles = were being "pulled back" along maps to their base spaces. And I can = still hear the late Serge Lang, bless his soul, intoning "pooll-back" = and "poosh-out" in his characeristic French accent, in Columbia = courses and seminars from the late '50s and early '60s. So the terms were pretty well established (and pull-back, anyway, = pretty well motivated), at least at Columbia, that early. Cheers, -- Fred