From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/896 Path: news.gmane.org!not-for-mail From: street@mpce.mq.edu.au (Ross Street) Newsgroups: gmane.science.mathematics.categories Subject: Re: cogenerator in omegaCat ? Date: Thu, 22 Oct 1998 09:36:19 +1000 (EST) Message-ID: NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1241017303 28175 80.91.229.2 (29 Apr 2009 15:01:43 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 29 Apr 2009 15:01:43 +0000 (UTC) To: categories@mta.ca Original-X-From: cat-dist Thu Oct 22 16:47:40 1998 Original-Received: (from Majordom@localhost) by mailserv.mta.ca (8.8.8/8.8.8) id PAA18022 for categories-list; Thu, 22 Oct 1998 15:45:14 -0300 (ADT) X-Authentication-Warning: mailserv.mta.ca: Majordom set sender to cat-dist@mta.ca using -f X-MIME-Autoconverted: from quoted-printable to 8bit by mailserv.mta.ca id UAA14996 Original-Sender: cat-dist@mta.ca Precedence: bulk Original-Lines: 35 Xref: news.gmane.org gmane.science.mathematics.categories:896 Archived-At: As to the cocompleteness of Omega-Cat, it is a result of Harvey Wolff that V-Cat is cocomplete for decent V. By induction, it follows that n-Cat is cocomplete (since (n+1)-Cat = n-Cat). A limiting process gives that Omega-Cat is also cocomplete. However, a better approach is to use a result of Michael Batanin that Omega-Cat is finitarily monadic over globular sets (a presheaf category). It follows that Omega-Cat is cocomplete. The required monad on globular sets is beautiful: it involves plane trees. See: M. Batanin, Monoidal globular categories as a natural environment for the theory of weak n-categories, Advances in Mathematics 136 (1998) 39-103. R. Street, The role of Michael Batanin's monoidal globular categories, Proceedings of the Workshop on Higher Category Theory and Mathematical Physics at Northwestern University, Evanston, Illinois, March 1997 (to appear). M. Batanin, Computads for finitary monads on globular sets, Proceedings of the Workshop on Higher Category Theory and Mathematical Physics at Northwestern University, Evanston, Illinois, March 1997 (to appear). M. Batanin and R. Street, The universal property of the multitude of trees, Macquarie Mathematics Report 98/233, March 1998 (submitted). R. Street, The petit topos of globular sets, Macquarie Mathematics Report 98/232 (March 1998; talk at the "Billfest" in Montréal, September, 1997; submitted). Regards, Ross