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Results tagged with big-list
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user 45470
Questions designed to generate a "big list" of certain results, examples, conjectures, etc. via many individual answers, each contributing one or a few instances. Such a question should typically be in Community Wiki mode (CW); after asking, please, flag for moderators attention requesting the question to be made CW.
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votes
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 …