From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.science.mathematics.categories/6958 Path: news.gmane.org!not-for-mail From: Ronnie Brown Newsgroups: gmane.science.mathematics.categories Subject: Re: Albrecht Dold, R.i.P. Date: Fri, 07 Oct 2011 22:13:39 +0100 Message-ID: References: Reply-To: Ronnie Brown NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: dough.gmane.org 1318077542 16266 80.91.229.12 (8 Oct 2011 12:39:02 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Sat, 8 Oct 2011 12:39:02 +0000 (UTC) Cc: categories@mta.ca Original-X-From: majordomo@mlist.mta.ca Sat Oct 08 14:38:55 2011 Return-path: Envelope-to: gsmc-categories@m.gmane.org Original-Received: from smtpx.mta.ca ([138.73.1.4]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1RCWB3-00066c-N1 for gsmc-categories@m.gmane.org; Sat, 08 Oct 2011 14:38:54 +0200 Original-Received: from mlist.mta.ca ([138.73.1.63]:44547) by smtpx.mta.ca with esmtp (Exim 4.76) (envelope-from ) id 1RCW98-0005eq-1G; Sat, 08 Oct 2011 09:36:54 -0300 Original-Received: from majordomo by mlist.mta.ca with local (Exim 4.71) (envelope-from ) id 1RCW96-00046Q-H6 for categories-list@mlist.mta.ca; Sat, 08 Oct 2011 09:36:52 -0300 In-Reply-To: Precedence: bulk Xref: news.gmane.org gmane.science.mathematics.categories:6958 Archived-At: Two major things I learned from Albrecht Dold. One was the Dod-Kan=20 theorem, on the equivalence between chain complexes and simplicial=20 abelian groups, which was a major input to my doctoral thesis on the=20 finding k-invariants of function spaces; and second, when in the 1960s=20 he was lecturing at Liverpool on half-exact functors, I realised that=20 for publication purposes on this material, I could cut out long and =20 detailed formulae for a homotopy equivalence making a diagram=20 commutative, since its existence followed from naturality! Both of these aspects have continued to influence my work on crossed=20 complexes and nonabelian algebraic topology. Ronnie On 07/10/2011 14:15, Andreas Blass wrote: > Albrecht Dold taught the algebraic topology course that I took in my fi= rst year as a graduate student. His beautifully organized presentation o= f this material was largely responsible for my becoming interested in cat= egory theory. He made both the power and the beauty of functors evident. > > Andreas Blass > > Begin forwarded message: > >> From: "Fred E.J. Linton" >> Date: 6 October, 2011 9:13:26 PM EDT >> To: "categories" >> Subject: categories: Albrecht Dold, R.i.P. >> Reply-To: "Fred E.J. Linton" >> >> From today's IMU newsletter: >> >> | 6. DEATH OF ALBRECHT DOLD ON 26-09-2011. >> | >> | Albrecht Dold, known for fundamental contributions to algebraic >> | topology, was born in Germany in 1928. He held positions in Heidelbe= rg, >> | Z=FCrich, Princeton and Columbia. He has been Vice-president of IMU = in >> 1995-98. >> >> I particularly mourn his passing, as it was Dold's algebraic topology >> lectures at Columbia around 1961 (+/- 1) that taught me virtually all >> I know, or would ever learn later, about the Yoneda Lemma. >> >> Born August 5, 1928, in Triberg, Germany, and barely a teenager during >> WW II, Dold would have been 83 at the time of his death. >> >> -- Fred [For admin and other information see: http://www.mta.ca/~cat-dist/ ]