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

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

13 votes
2 answers
183 views

Behavior of certain random products of power series

6 votes
3 answers
756 views

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

17 votes
1 answer
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Prove that except for $n=1$, there are more topologies of size $n$ than groups of order $n$

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1 answer
127 views

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

6 votes
1 answer
180 views

A too good to be true moment inequality for empirical processes

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40 views

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

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Finding all integer solutions to a family of elliptic curves depending on a parameter $n$

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Eigenvalues of analytic matrix families

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Do K-well generated categories exist for any regular K?

29 votes
3 answers
2k views

Project Hail Mary, question? (Spoiler)

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1 answer
223 views

Existence of element $(x_0,y)$ in a set of common zeros for all $(x_0,y)$ satisfying system of inequalities

4 votes
2 answers
272 views

Rigidifying $E_\infty$ structures

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