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32 votes

Combinatorics looks incomprehensible, is it that I lack "mathematical maturity" and what should I do?

combinatorics soft-question self-learning advice asked Feb 11, 2017 at 5:57
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19 votes

An interesting geometry problem about incenter and ellipses.

geometry conic-sections triangle-centres asked Aug 19, 2016 at 13:25
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19 votes

Fermat's last theorem for entire functions

complex-analysis number-theory entire-functions asked Jun 2, 2020 at 1:54
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18 votes

An old question about sumsets and difference sets

combinatorics discrete-mathematics additive-combinatorics difference-sets asked Sep 5, 2016 at 5:09
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14 votes

What are some good books on algebraic inequalities?

inequality reference-request contest-math book-recommendation asked Apr 10, 2016 at 5:50
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14 votes

Prerequisites for representation theory

reference-request representation-theory asked Apr 15, 2018 at 12:19
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14 votes

Books for a thorough introduction to ring theory?

ring-theory reference-request book-recommendation asked Nov 19, 2017 at 7:43
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12 votes

Maximum value $c$ s.t. $\exists$ a subset $S$ of $\{z_1,z_2,\ldots,z_n\}$ s.t. $\left|\sum_{z\in S}z\right|\geq c$ ($\sum_{i=1}^{n}|z_i|=1$).

complex-analysis analysis complex-numbers asked Sep 7, 2016 at 14:42
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11 votes

$\operatorname{rank}(A^2)+\operatorname{rank}(B^2)\geq2\operatorname{rank}(AB)$ whenever $AB=BA$?

linear-algebra matrices inequality matrix-rank asked Nov 26, 2018 at 13:40
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10 votes

How do I show that $\frac {a^2}b + \frac {b^2}c + \frac {c^2}d + \frac {d^2}a \ge 4$ for $a^2 + b^2 + c^2 + d^2 = 4$?

inequality asked Apr 15, 2016 at 14:34
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