From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/8483 Path: news.gmane.org!not-for-mail From: Ross Street Newsgroups: gmane.science.mathematics.categories Subject: Re: Our friend Bob Walters Date: Sun, 1 Feb 2015 09:29:28 +1100 Message-ID: References: Reply-To: Ross Street NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1422746421 8383 80.91.229.3 (31 Jan 2015 23:20:21 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 31 Jan 2015 23:20:21 +0000 (UTC) Cc: categories@mta.ca To: wlawvere Original-X-From: majordomo@mlist.mta.ca Sun Feb 01 00:20:21 2015 Return-path: Envelope-to: gsmc-categories@m.gmane.org Original-Received: from smtp3.mta.ca ([138.73.1.127]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1YHhKt-0003uI-FM for gsmc-categories@m.gmane.org; Sun, 01 Feb 2015 00:20:19 +0100 Original-Received: from mlist.mta.ca ([138.73.1.63]:34218) by smtp3.mta.ca with esmtp (Exim 4.80) (envelope-from ) id 1YHhJz-0007TQ-6c; Sat, 31 Jan 2015 19:19:23 -0400 Original-Received: from majordomo by mlist.mta.ca with local (Exim 4.71) (envelope-from ) id 1YHhJz-0006hz-If for categories-list@mlist.mta.ca; Sat, 31 Jan 2015 19:19:23 -0400 In-Reply-To: Precedence: bulk Xref: news.gmane.org gmane.science.mathematics.categories:8483 Archived-At: Dear Colleagues This is devastating news.=20 Bob started at Sydney University after finishing his PhD in 1970 at=20 the Australian National University. I started at Macquarie the same year. That is when our friendship and collaboration began. He was an exciting person to work with and I admired him greatly. We started thinking about Yoneda structures almost immediately. Bob was a major influence on category theory in general but especially on Australian category theory. His charismatic lectures to undergraduates at Sydney University encouraged many students=20 to continue in mathematics and category theory. He saw early,=20 in his own original terms, how categories applied to computer science. One of Bob=92s great achievements was understanding Higg=92s work on Heyting-valued equality in the light of Bill Lawvere=92s insight into Cauchy completion via adjointness. This gave a vital reason for extending enriched category to a base bicategory. There is so much to Bob=92s work and influence.=20 The latest issue of Applied Categorical Structures landed on my=20 desk just last week; Bob is a joint author of a paper there.=20 I was hoping to see Bob at CT2014 in Cambridge. He had planned to go and to speak. This wasn=92t to be. As Bill said, our deepest condolences are with his family.=20 Ross =20 =20= [For admin and other information see: http://www.mta.ca/~cat-dist/ ]