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7 votes
1 answer
413 views

A vanishing hypergeometric series

7 votes
2 answers
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Hurwitz integers represented as sums of two squares of Hurwitz integers

32 votes
6 answers
2k views

Precise meaning of "picking a basis"?

5 votes
1 answer
950 views

Classifying space BG and contractable space EG

2 votes
0 answers
67 views

Elements of $\pi_2$ can be approximated by smooth embeddings

7 votes
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558 views

Defining the cotangent complex via equivalence classes of derived étale curves

-2 votes
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124 views

Cancellations and boundedness in product of $2^\tau \prod_{i=1}^{s'}p_i^{r'_i}$th cyclotomic polynomials

5 votes
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179 views

Finding lots of big sets in a probability space which intersect pairwise

12 votes
1 answer
682 views

No real roots of $\frac{1}{2^{1+it}} + \frac{1}{3^{1+it}} + \frac{1}{5^{1+it}}$

17 votes
6 answers
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If Erdős is published as Erdös in a paper, which do I cite?

12 votes
2 answers
605 views

Free fermions in dimensions 2 and 3

2 votes
1 answer
88 views

How to equationally witness exactness?

1 vote
0 answers
19 views

Embeddability order on Picard groups

102 votes
22 answers
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List of crowdsourced math projects actively seeking participants

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