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

10 votes

Recent breakthroughs with applied origins

If you include mathematical physics (string theory, QFT) to "applied mathematics", the breakthroughs are too numerous to list them here. Statistical mechanics is especially productive in its influence …
53 votes

Has the mathematics research community ever been led astray by a dumb mistake?

In 1970, Irwing Noel Baker "proved" that a transcendental entire function of one complex variable can have at most one completely invariant component of the set of normality. In fact he "proved" a mor …
26 votes

Has the mathematics research community ever been led astray by a dumb mistake?

Hilbert problem 16, second part asks for an upper estimate of the number of limit cycles of a polynomial system of differential equations in dimension 2. For long time it was believed that Henri Dulac …
-3 votes

Etymology of “real numbers"

An excellent explanation is given in the short paper of N. J. Wildberger, Real fish, real numbers, real jobs, The Mathematical Intelligencer 21 (1999) pp 4–7. https://doi.org/10.1007/BF03024838 (Rese …
Alexandre Eremenko's user avatar
3 votes

History of Gauss theorems that say "it clearly follows that" but it did not clearly follow

This could be related to the "Gauss problem" on the limit distribution of remainders of partial fractions. Gauss found this distribution, and in a letter to Laplace, claimed that he proved it. The fir …
Alexandre Eremenko's user avatar
20 votes

(Obscure) areas of mathematics that are largely inactive or forgotten today?

The most difficult condition to satisfy is 1, since Google book "knows" most of books. All other conditions are easy to satisfy, and many examples can be given, but I will give only one. Princeton Com …
Alexandre Eremenko's user avatar
9 votes

What is an important mathematical question?

It is indeed somewhat subjective. A discussion of this, with examples, is contained in Hardy's book Mathematician's Apology. But mathematicians frequently disagree on many questions whether they are i …
15 votes

What is the origin/history of the following very short definition of the Lebesgue integral?

This approach was used in the German Analysis (Calculus) textbook MR0222221 Hans Grauert and Ingo Lieb, Differential- und Integralrechnung. Band I: Funktionen einer reellen Veränderlichen, Heidelberge …
Alexandre Eremenko's user avatar
15 votes

Papers of the masters translated to English in one location

Most of the famous 19th century mathematicians have their collected works published and some of them have been digitized. But they are all in the original language. Translations into English are rare. …
29 votes

Algebraic geometry over the complex numbers, and beyond

Algebraic geometry began over the field of reals. What Apollonius of Perga did would be certainly qualified today as algebraic geometry: he classified real plane curves of second order and studied the …
Alexandre Eremenko's user avatar
62 votes
Accepted

Is spherical trigonometry a dead research area?

It is not. As a proof, I will mention three relatively recent papers where I am a co-author: M. Bonk and A. Eremenko, Covering properties of meromorphic functions, negative curvature and spherical geo …
Alexandre Eremenko's user avatar
4 votes

Can the theory of elliptic functions developed from purely geometric considerations?

Some elementary parts of the theory of elliptic functions can indeed be developed in this way. To those books listed by Alexey Ustinov I can add a large treatise by G. Halphen, Traité des fonctions el …
Alexandre Eremenko's user avatar
1 vote

Nicely motivated papers or book chapters on the formula for the sum of the $k$-th powers of ...

G. Polya, Mathematical discovery.
Alexandre Eremenko's user avatar
20 votes

Who was H. Vogt?

According to Zentralblatt (which is freely accessible on Internet, since Jan 1, 2021, btw) Henri Gustave Vogt was a mathematician, apparently French, since he wrote in French, published in French jour …
14 votes

Nontrivially fillable gaps in published proofs of major theorems

Since some answers include the results published before 1950, let me include the famous story of Hilbert's Problem on finiteness of the number of limit cycles of a polynomial vector field in the plane …

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