From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/10804 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Posina Venkata Rayudu Newsgroups: gmane.science.mathematics.categories Subject: Isbell conjugacy Date: Mon, 26 Sep 2022 04:26:46 +0530 Message-ID: Reply-To: Posina Venkata Rayudu Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="32150"; mail-complaints-to="usenet@ciao.gmane.io" To: categories Original-X-From: majordomo@rr.mta.ca Wed Sep 28 02:34:46 2022 Return-path: Envelope-to: gsmc-categories@m.gmane-mx.org Original-Received: from smtp2.mta.ca ([198.164.44.75]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1odL2D-00083o-Vm for gsmc-categories@m.gmane-mx.org; Wed, 28 Sep 2022 02:34:46 +0200 Original-Received: from rr.mta.ca ([198.164.44.159]:60388) by smtp2.mta.ca with esmtp (Exim 4.80) (envelope-from ) id 1odL18-0003HI-DO; Tue, 27 Sep 2022 21:33:38 -0300 Original-Received: from majordomo by rr.mta.ca with local (Exim 4.92.1) (envelope-from ) id 1odL0j-0004PM-R7 for categories-list@rr.mta.ca; Tue, 27 Sep 2022 21:33:13 -0300 Precedence: bulk Xref: news.gmane.io gmane.science.mathematics.categories:10804 Archived-At: Dear All, I hope and pray you and your families are all well. If I may, Isbell conjugacy (https://conceptualmathematics.wordpress.com/2022/08/30/birkhoffs-theorem-from-a-geometric-perspective-a-simple-example/; see p. 17 in http://tac.mta.ca/tac/reprints/articles/8/tr8.pdf; given the current world situation, I thought it is good to have a copy of important papers in multiple locations) is about a category of contravariant functors and the dual category of a category of covariant functors. Is Isbell conjugacy implicit in CO- and CONTRA-VARIANCE and DUALIZATION? Pardon me if this is silly. I eagerly look forward to your corrections and clarifications. Happy Daughters' Day :-) Thanking you, posina [For admin and other information see: http://www.mta.ca/~cat-dist/ ]