From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/9279 Path: news.gmane.org!.POSTED!not-for-mail From: David Roberts Newsgroups: gmane.science.mathematics.categories Subject: Algebraic closures and arithmetic universes Date: Tue, 1 Aug 2017 09:56:01 +0930 Message-ID: Reply-To: David Roberts NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1501547476 4425 195.159.176.226 (1 Aug 2017 00:31:16 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 1 Aug 2017 00:31:16 +0000 (UTC) To: "categories@mta.ca list" Original-X-From: majordomo@mlist.mta.ca Tue Aug 01 02:31:12 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 1dcL5Y-0000cl-Cz for gsmc-categories@m.gmane.org; Tue, 01 Aug 2017 02:31:08 +0200 Original-Received: from mlist.mta.ca ([138.73.1.63]:39489) by smtp2.mta.ca with esmtp (Exim 4.80) (envelope-from ) id 1dcL5A-0003cB-5u; Mon, 31 Jul 2017 21:30:44 -0300 Original-Received: from majordomo by mlist.mta.ca with local (Exim 4.71) (envelope-from ) id 1dcL52-0002d9-SL for categories-list@mlist.mta.ca; Mon, 31 Jul 2017 21:30:36 -0300 Precedence: bulk Xref: news.gmane.org gmane.science.mathematics.categories:9279 Archived-At: Hi, There's a question at MathOverflow on the construction of algebraic closures in constructive mathematics by Joyal. The idea as far as I can tell is to construct the classifying arithmetic universe for the theory of the algebraic closure. People might either be interested or have something to contribute https://mathoverflow.net/q/277551/4177 I repeat my respectful call for Andr=C3=A9 to release his notes of arithmet= ic universes for us all to use, or at the least confirm that Maietti et al found the same definition :-) Best regards, David [For admin and other information see: http://www.mta.ca/~cat-dist/ ]