Top Questions

3 votes
7 answers
1k views

Categories that admit all products but not all coproducts

29 votes
2 answers
1k views

Applications of Categorical Logic to Logic

35 votes
1 answer
2k views

Clausen–Scholze's Theorem 9.1 of Analytic.pdf, in view of light condensed sets, AKA is the Liquid Tensor Experiment easier now?

17 votes
1 answer
3k views

Assuming the Collatz conjecture is false, what is known about the size of the false set?

29 votes
1 answer
1k views

Can $9xy$ divide $1+x^2+x^3+y^2$?

20 votes
3 answers
571 views

Examples when quantum $q$ equals to arithmetic $q$

20 votes
2 answers
2k views

Tennenbaum's Theorem and polynomials

11 votes
4 answers
1k views

Six consecutive positive integers with certain shape

21 votes
1 answer
1k views

Does greedy circle packing exhaust the measure of every bounded open set in the plane?

13 votes
2 answers
1k views

Using the Eichler-Selberg Trace formula to compute class numbers?

6 votes
3 answers
465 views

Evaluating the infinite product $\prod_{k\geq 2}(1-\frac{1}{k^3})$

7 votes
3 answers
602 views

What are journal rankings that employers look at? [closed]

20 votes
1 answer
1k views

Irreducibility of the polynomial $x^n+5x+3$ over $\mathbb{Q}$

18 votes
1 answer
1k views

Does a function from $\mathbb R^2$ to $\mathbb R$ which sums to 0 on the corners of any unit square have to vanish everywhere?

14 votes
1 answer
1k views

Hilbert's sixth problem and QFT description

15 votes
2 answers
1k views

Is it decidable whether two real algebraic irrationals generate the same extension of the rationals?

12 votes
2 answers
987 views

Prime differences and zero multiplicity

14 votes
2 answers
1k views

How can I (semi-formally) convince myself that Euclidean geometry comports with visual intuition?

8 votes
3 answers
580 views

Do there exist positive integers $m$, $n$, $p$, $q$ such that $m>1$, $p\neq q$, $p$ and $q$ divide $mn^2 - 1$, and $mn$ divides $p - q$?

11 votes
2 answers
525 views

Let $a_1, \dots, a_n$ be a finite set of positive reals. Is there a $\mathbb Q$-basis of $\mathbb R$ where each $a_i$ has nonnegative coordinates?

11 votes
2 answers
699 views

How small can maximal subgroups be?

8 votes
4 answers
498 views

Residual finiteness of hyperbolic 3-manifold groups

7 votes
2 answers
609 views

Ideals generated by Turing independent sets

11 votes
2 answers
729 views

What relationship is there between repeated roots of discriminants and orders of roots of the original polynomials?

6 votes
2 answers
400 views

Embedding $\mathrm{SL}_n(3)$ into $\mathrm{SL}_n(p)$

2 votes
3 answers
523 views

Solving the unknotting problem by pulling both ends of the string

7 votes
2 answers
594 views

Polynomials such that $|p(z)|\leq p(|z|)$

7 votes
4 answers
432 views

A conservative extension of Peano Arithmetic

11 votes
1 answer
888 views

Relation between motives and geometric Langlands

7 votes
2 answers
481 views

Whether the pure implicational fragment of intuitionistic propositional logic is a finitely-many valued logic

12 votes
1 answer
674 views

Can proper classes have different sizes?

18 votes
1 answer
1k views

Let $R, S$ be infinite sets. Alice and Bob will play a game over $R\times S$

2 votes
2 answers
714 views

Sum of three square is a square and sum of their product taken two at a time is also a square

4 votes
3 answers
414 views

Does the uniform boundedness principle holds for multilinear maps as well?

5 votes
3 answers
320 views

Bar construction in commutative algebras is calculated by pushout

11 votes
2 answers
497 views

Jacobi symbols for two-square sums of primes

3 votes
1 answer
591 views

Geometric mean of prime factors of all numbers up to n

24 votes
1 answer
2k views

Global character of ABC/Szpiro inequalities

11 votes
1 answer
372 views

Plus construction on Simplicial Sets?

5 votes
2 answers
467 views

On the derivative of the Bernstein polynomial

5 votes
2 answers
530 views

Representing natural numbers as sums of distinct prime powers

5 votes
1 answer
346 views

Second-order ordinal definability

9 votes
1 answer
438 views

Does proper forcing preserve properness under PFA?

9 votes
1 answer
925 views

Is it fine to correct and extend texts of a late colleague when publishing them?

7 votes
1 answer
526 views

Original proof of Hilbert irreducibility theorem

8 votes
1 answer
308 views

Consistency strength of strongly compact cardinal

3 votes
4 answers
289 views

Bijections on the set of integer partitions of $n$

7 votes
3 answers
605 views

A continuous version of Carathéodory's convex hull theorem


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