From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/3317 Path: news.gmane.org!not-for-mail From: Thomas Streicher Newsgroups: gmane.science.mathematics.categories Subject: regular monos not closed under composition Date: Tue, 16 May 2006 22:20:31 +0200 (CEST) Message-ID: <26608.2267663025$1241019226@news.gmane.org> NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1241019225 8215 80.91.229.2 (29 Apr 2009 15:33:45 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 29 Apr 2009 15:33:45 +0000 (UTC) To: categories@mta.ca Original-X-From: rrosebru@mta.ca Tue May 16 22:01:15 2006 -0300 X-Keywords: X-UID: 261 Original-Lines: 6 Xref: news.gmane.org gmane.science.mathematics.categories:3317 Archived-At: I know that regular monos needn't be closed under composition. One example being the category of monoids. Are there other *natural* examples, e.g. of topological kind? Thomas Streicher