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Results tagged with gm.general-mathematics
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user 45470
Questions about mathematics which don't fall into the other arXiv categories. If you have a general question about mathematics but it is not research level, it's off-topic but it might be welcomed on Mathematics Stack Exchange.
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Structures that turn out to exhibit a symmetry even though their definition doesn't
Let $r_4(n)$ be the number of $4$-tuples $a,b,c,d\in \bf Z$ satisfying
$a^2+b^2+c^2+d^2=n$. Then $\sum_{n\geq 0}r_4(n)e^{2\pi i\, nz}dz$ is a
holomorphic differential form on the upper half-plane tha …