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Are recursively defined sets countable?

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Optimal play in a splitting game on diamond-shaped polyominoes

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What is the volume of $\Sigma(2, 3, 13)$ associated with its $\widetilde{\operatorname{SL}(2, \mathbb{R})}$ geometry?

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On formal systems for $\mathsf{BISH}$, $\mathsf{INT}$, and $\mathsf{RUSS}$ in constructive reverse mathematics

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Are there any other norms besides cut norm defined on graphon?

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1 answer
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Derivative bounds for self convolution of the spherical measure in $R^d$

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Generalizing square wheels rolling on inverted catenaries

54 votes
35 answers
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Most intriguing mathematical epigraphs

80 votes
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What is Koszul duality?

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14 answers
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Is amateur research in mathematics viable?

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In the absence of choice, is there a definition of cardinality in terms of surjective relations?

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Central idempotents from characters in Frobenius algebras (generalizing Lusztig arXiv:math/0208154v2 §19)

2 votes
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Relating classic spectral decomposition with Euclidean Jordan algebras

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On non-increasing property of a norm-like function on matrices

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