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Questions that are about research in mathematics, or about the job of a research mathematician, without being mathematical problems or statements in the strictest sense. Do not use this tag for easy or supposedly easy mathematical questions.

31 votes

Mistakes in mathematics, false illusions about conjectures

The simplicial homology of a simplicial complex is not a function of the complex, but of the complex together with a simplicial decomposition. The Hauptvermutung ("main conjecture") stated that simpli …
5 votes

Demystifying complex numbers

From the point of view of enginieers, the most obvious application of complex numbers is computing alternating currents. Consider first direct current. If you have a network of resistors, and want to …
2 votes

Old books you would like to have reprinted with high-quality typesetting

Topics in multiplicative number theory by H.L. Montgomery. It is not out of print, but a version in LaTeX quality would be a significant improvement.
10 votes

Can anything deep be said uniformly about conjectures like Goldbach's?

There exist surprising counterexamples. Elsholtz and Dietmann found the following: If $p\equiv 7\pmod{8}$ is prime, then the equation $x^2+y^2+z^4=p^2$ has no non-trivial solution. You might argue tha …
Jan-Christoph Schlage-Puchta's user avatar