User luis felipe - MathOverflow most recent 30 from http://mathoverflow.net 2013-05-26T08:48:05Z http://mathoverflow.net/feeds/user/28144 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/111724/who-wrote-up-banachs-thesis/112539#112539 Answer by Luis Felipe for Who wrote up Banach's Thesis? Luis Felipe 2012-11-16T01:51:02Z 2012-11-16T13:20:01Z <p>In StanisÅ‚aw Ulam's autobiography <a href="http://libgen.info/view.php?id=760449" rel="nofollow">http://libgen.info/view.php?id=760449</a> you can find several references in that sense (mainly in the first Part) about the mathematicians at Lwów in that time, maybe the clearest one is on page 38:</p> <p>"In general, the Lwów mathematicians were on the whole somewhat reluctant to publish. Was it a sort of pose or a psychological block? I don't know. It especially affected Banach, Mazur, and myself, but not Kuratowski, for example."</p> http://mathoverflow.net/questions/112536/is-there-something-interesting-in-the-uniqueness-condition-for-a-sheaf Is there something interesting in the uniqueness condition for a sheaf? Luis Felipe 2012-11-16T00:43:45Z 2012-11-16T00:43:45Z <p>After digesting the Presheaf definition by the very first time, one feels (at least I felt) a strange sensation noticing the existence and uniqueness conditions to graduate that Presheaf as a sheaf, but although some "natural" examples are given to show that the existence condition is not garanted (bounded functions is the canonical one), all examples that I occur are bizarre and absolutely unnatural, in the text books I've seen I found nothing.</p> <p>So the question is: Is there some "interesting" and/or "natural" Presheaf (I mean a Presheaf useful for something at least pedagogically) which supports existence and fails only the uniqueness condition?</p> <p>Thanks</p> http://mathoverflow.net/questions/113947/does-the-lhc-discourages-modern-geometry-certain-part-of-it Comment by Luis Felipe Luis Felipe 2012-11-20T15:50:20Z 2012-11-20T15:50:20Z @David Loeffler: Riemann's ideas were used in physics in much less than a century after his death, and no, I do not think so, thanks for asking