From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/9463 Path: news.gmane.org!.POSTED!not-for-mail From: Steve Vickers Newsgroups: gmane.science.mathematics.categories Subject: Re: How analogous are categorial and material set theories? Date: Fri, 8 Dec 2017 06:49:49 +0000 Message-ID: References: Reply-To: Steve Vickers NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 (1.0) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1512748407 2660 195.159.176.226 (8 Dec 2017 15:53:27 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 8 Dec 2017 15:53:27 +0000 (UTC) Cc: categories@mta.ca To: Patrik Eklund Original-X-From: majordomo@mlist.mta.ca Fri Dec 08 16:53:21 2017 Return-path: Envelope-to: gsmc-categories@m.gmane.org Original-Received: from smtp2.mta.ca ([198.164.44.40]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eNKxj-0000Pz-3J for gsmc-categories@m.gmane.org; Fri, 08 Dec 2017 16:53:19 +0100 Original-Received: from mlist.mta.ca ([138.73.1.63]:40652) by smtp2.mta.ca with esmtp (Exim 4.80) (envelope-from ) id 1eNKyG-0002sk-JB; Fri, 08 Dec 2017 11:53:52 -0400 Original-Received: from majordomo by mlist.mta.ca with local (Exim 4.71) (envelope-from ) id 1eNKwn-0003l9-8X for categories-list@mlist.mta.ca; Fri, 08 Dec 2017 11:52:21 -0400 Precedence: bulk Xref: news.gmane.org gmane.science.mathematics.categories:9463 Archived-At: Dear Patrik, The theory of categories is a first order theory, so what exactly are you de= nying here? Steve. > On 7 Dec 2017, at 18:58, peklund@cs.umu.se wrote: >=20 > Is Category Theory a Theory? I think not. At least not in a logical > sense. >=20 [For admin and other information see: http://www.mta.ca/~cat-dist/ ]