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Nov 19, 2015 at 11:53 comment added Ronnie Brown G.-C. Rota "Indiscrete Thoughts" : `“What can you prove with exterior algebra that you cannot prove without it?" ..... In my time, I have heard it repeated for random variables, Laurent Schwartz' theory of distributions, ideles and Grothendieck's schemes, to mention only a few. A proper retort might be: "You are right. There is nothing in yesterday's mathematics that could not also be proved without it. Exterior algebra is not meant to prove old facts, it is meant to disclose a new world. Disclosing new worlds is as worthwhile a mathematical enterprise as proving old conjectures.” '
Nov 19, 2015 at 11:35 comment added Ronnie Brown I can't resist mentioning that I published in 1967 a paper generalising the standard van Kampen theorem by using the fundamental groupoid $\pi_1(X,C)$ on a set of base points, thus enabling the computation of the fundamental group of the circle, and much more. No topology text in English other than my "Topology and Groupoids", mentions this theorem! See mathoverflow.net/questions/220561/… .
Apr 24, 2013 at 4:04 comment added S. Carnahan Yes, Hurewicz was not Dutch. On the other hand, I know some Chinese people with Irish names.
Mar 3, 2013 at 10:30 comment added Włodzimierz Holsztyński W.Hurewicz's first name--Witold--was a typical Dutch name NOT :-)
Feb 13, 2013 at 21:26 history edited Nick Matteo CC BY-SA 3.0
wedge sum is \vee, arg
Feb 13, 2013 at 16:36 comment added Timothy Chow A good example that I had not heard of before!
Feb 13, 2013 at 12:59 history answered Nick Matteo CC BY-SA 3.0