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History and philosophy of mathematics, biographies of mathematicians, mathematics education, recreational mathematics, communication of mathematics.

26 votes

What is the oldest open math problem outside of number theory?

Stability of the Solar System ? (Question often attributed to Newton in Opticks, 1717 or 1730.) To further specify as requested by Timothy Chow, make it a few ($3\leqslant N\leqslant 8$) planets under …
Francois Ziegler's user avatar
13 votes

The orders of the exceptional Weyl groups

My guess: these orders were first computed by Coxeter in his thesis The polytopes with regular-prismatic vertex figures, Philos. Transactions (A) 229, 329–425 (1930). ZBL56.1119.03, $E_l$ as $(\math …
Francois Ziegler's user avatar
14 votes

Whence “uniform distribution”?

It’s far from true. For one thing, Crofton in his famous paper (1869, p. 198) speaks of points “distributed with uniform density over the plane” (my bold). Moreover he refers to prior discussion in Th …
Francois Ziegler's user avatar
34 votes
Accepted

Serre’s comment on Hurwitz: connecting FLT to points of finite order on elliptic curves

On page 322 of Serre, Jean-Pierre, The works of Wiles (and Taylor,(\dots)). I., Séminaire Bourbaki. Volume 1994/95. Exposés 790-804. Paris: Société Mathématique de France, Astérisque. 237, 319-332, Ex …
Francois Ziegler's user avatar
13 votes
Accepted

Why are distributions "tempered"?

Can someone explain, why in English the name "tempered" wins? Presumably because that’s how the inventor himself translated it (French past participle to English past participle), on e.g. p. 188 of …
Francois Ziegler's user avatar
23 votes

First use of term "Hilbert's Nullstellensatz"

I think it is indeed van der Waerden, but in the earlier paper [1926], where he sounds just like one does when introducing terminology: translated from p. 143, the proposition in question is an almos …
Francois Ziegler's user avatar
17 votes
Accepted

Why are faithful actions called faithful and who first called them faithful?

The German word is treu, and I would look to papers by Hermann Weyl for its introduction. E.g. Quantenmechanik und Gruppentheorie (1927, p. 16): Da das Gruppenschema aus der Darstellung abstrahiert w …
Francois Ziegler's user avatar
9 votes
Accepted

Élie Cartan's paper "Les groupes réels simples, finis et continus" of 1914

The paper and its progeny are discussed at length in Helgason (1978, p. 537): In his paper [2] Cartan classifies the simple Lie algebras over R. His method, which required formidable computations, us …
Francois Ziegler's user avatar
5 votes

Mathematicians with both “very abstract” and “very applied” achievements

Mikhail L. Zeitlin, or Gel’fand-Zeitlin basis fame (1950), later switched to “game theory, the theory of automata, computer science, physiology, and mathematical methods of biology”.
8 votes

Unknown work of Nöbeling on topological/Hausdorff dimension

It seems to be: Nöbeling, G., Hausdorffsche und mengentheoretische Dimension, Ergebnisse math. Kolloquium Wien 3, 24-25 (1931). ZBL57.0749.02. Google shows the first and sporadically the second pa …
Francois Ziegler's user avatar
13 votes
Accepted

Origin of the term 'index of a subgroup'

The short answer is Cauchy, with only justification: “for short”. Burnside’s Theory of groups of finite order (1897) has a useful glossary stating, p. 382 (my bold): The ratio of the order of a su …
Francois Ziegler's user avatar
6 votes

History of the notion of irreducible representation

I convert my comments to an answer per Abdelmalek’s request: Dieudonné attributes the classification of irreducible $sl_2$-modules to Cayley (1856). Also the theory of spherical and cylindrical harm …
Francois Ziegler's user avatar
16 votes

Why are parabolic subgroups called "parabolic subgroups"?

The naming (attributed by Borel as quoted by @GjergjiZaimi) happened quite publicly, in Roger Godement : Groupes linéaires algébriques sur un corps parfait, Sémin. Bourbaki 13 (1960/61), Exp. No. 206, …
Francois Ziegler's user avatar
5 votes

Mathematicians with both “very abstract” and “very applied” achievements

Just came across a page of 25+ of Mark Goresky’s Engineering publications.
2 votes

Tweetable Mathematics

If $S^n$ x $S^n$ minus diag & antidiag self deforms and each (x,y) → (y,x) then n = 1, 3, 7, 15, 31, 63 or 127 (Kervaire invariant). (Stolen from the epigraph of I. M. James, The topology of Stiefel …

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