Hottest Questions This Month

36 votes

6 answers

3k views

Gromov's thesis: Any property holding for all finitely generated groups must hold for trivial reasons

ADL

2,971

answered Apr 25 at 13:57

31 votes

4 answers

3k views

Why is it so difficult to define constructive cardinality?

Matt F.

426

answered Apr 28 at 17:21

41 votes

5 answers

3k views

How does the mathematical community handle minor, non-critical errors in published papers?

Teo Banica

1,363

answered Apr 21 at 23:26

28 votes

6 answers

3k views

Have you seen my power series?

Balazs

3,467

modified May 6 at 19:33

15 votes

3 answers

1k views

What is the group of homotopy classes from the 4-torus to the 3-sphere?

Tom Mrowka

3,704

modified Apr 18 at 2:04

12 votes

6 answers

1k views

Sum and sum of cubes are both perfect cubes

David G.

111

answered May 6 at 22:51

18 votes

2 answers

1k views

What is this modified arithmetico-geometric mean function?

Carlo Beenakker

195k

modified yesterday

15 votes

3 answers

2k views

Where did this Pólya's theorem appear?

Andrew T.

103

modified 1 hour ago

19 votes

1 answer

1k views

Reference request of quote about Gromov

Mikhail Katz

17.2k

modified Apr 21 at 8:28

31 votes

1 answer

2k views

Is there an “opposite” hypothesis to the (Generalized) Continuum Hypothesis?

The Amplitwist

1,501

modified Apr 17 at 17:38

9 votes

2 answers

447 views

When does the vanishing of $\pi_2$ imply asphericity of complex manifolds?

Moishe Kohan

14.2k

modified May 5 at 16:31

8 votes

3 answers

607 views

Asymptotics of alternating sum of squared binomials by contour integration

Alexey Ustinov

13.3k

modified Apr 13 at 17:22

14 votes

1 answer

1k views

Diagonalizing Pascal's triangle

Timothy Chow

85.3k

modified May 1 at 17:58

5 votes

3 answers

619 views

Why isn’t the weak-* topology normed?

Iosif Pinelis

136k

modified 16 hours ago

10 votes

2 answers

646 views

Is there a simple convex 3D polytope with an odd number of facets, all of which have an even number of sides?

Bernhard von Stengel

163

modified Apr 17 at 10:09

9 votes

1 answer

400 views

What is the optimal constant for $\|f\|_{L^\infty}\leq C\|f\|_{L^2}^{1/2}\|f'\|_{L^2}^{1/2}$?

Feng

689

modified Apr 15 at 1:02

9 votes

2 answers

746 views

When are two fourdimensional real vector bundles isomorphic?

Roberto Ladu

1,225

answered Apr 23 at 16:29

24 votes

1 answer

681 views

Does $x^3 + 1$ factor as a functor?

dhy

6,213

answered Apr 15 at 0:18

9 votes

4 answers

666 views

Function to measure consonance and dissonance in musical tones

Gabe K

6,136

answered Apr 29 at 21:15

8 votes

2 answers

557 views

Is there a more abstract or unified way to write the modulus condition in constructive definitions of real numbers?

Andrej Bauer

50.3k

modified Apr 17 at 10:21

6 votes

4 answers

233 views

The Gaussian cubic for $4p = L^2 + 27M^2$

Will Jagy

26.3k

modified Apr 22 at 0:24

17 votes

1 answer

720 views

On the strength of ZFC with Replacement removed and an ordinal construction axiom instead

JoshuaZ

7,766

modified Apr 24 at 12:59

10 votes

2 answers

416 views

Two square matrices $A, B$ such that $A^k, B^k$ have identical diagonals for all $k$

user1551

193

modified Apr 25 at 16:57

11 votes

2 answers

490 views

Preperiod of powers of matrices modulo m

Joris Nieuwveld

346

answered Apr 25 at 12:10

2 votes

2 answers

455 views

Locally isomorphic graphs

Gro-Tsen

35.5k

answered Apr 16 at 8:24

12 votes

1 answer

1k views

Who first defined vector fields as derivations?

Ulrik Buchholtz

1,622

answered Apr 14 at 21:29

10 votes

1 answer

506 views

Quotient groups of two finite groups

Dave Benson

18.9k

modified May 2 at 6:57

16 votes

1 answer

892 views

Matrices with many traceless powers

Anton Klyachko

4,216

modified Apr 29 at 8:42

15 votes

1 answer

650 views

Configurations of injections and surjections (without choice)

Gabe Goldberg

8,688

modified Apr 24 at 21:49

5 votes

2 answers

1k views

Mean Value Theorem 2.0

Iosif Pinelis

136k

modified May 2 at 20:55

8 votes

2 answers

293 views

Explicit smooth complex projective variety with fundamental group the finite cyclic group $C_d$

Some random guy

638

modified Apr 30 at 4:44

14 votes

1 answer

688 views

An identity involving binomial coefficients

Iosif Pinelis

136k

modified May 5 at 16:57

3 votes

1 answer

789 views

Missing factor of 10 in derivation for integral form of ζ(3)

user3840170

208

modified Apr 19 at 19:06

13 votes

1 answer

604 views

Where can I find a reference table for ordinal arithmetic?

Gro-Tsen

35.5k

answered yesterday

3 votes

2 answers

625 views

Algebraic proof that the left Maurer-Cartan form is well defined

Dmitri Pavlov

38.4k

answered Apr 28 at 17:02

10 votes

1 answer

377 views

Representations of the Burnside ring over a field of positive characteristic

Joshua Grochow

3,330

modified Apr 23 at 22:29

2 votes

3 answers

471 views

Examples of functions that vanish on a closed convex region and are positive outside

Daniele Tampieri

6,517

modified Apr 24 at 4:49

16 votes

1 answer

717 views

Best strategy to reach a half-plane without a compass

Jack Edward Tisdell

738

modified Apr 11 at 17:09

1 vote

1 answer

466 views

A correspondence between group extensions trivializing a cocycle, and a cocycle valued in the dual group [closed]

Andrea Antinucci

904

modified Apr 25 at 23:14

4 votes

1 answer

403 views

Definition of the stack of hyperelliptic curves

Joe Silverman

47.9k

modified Apr 24 at 13:44

9 votes

1 answer

400 views

On positive integers not representable as $ax^k+by^l+cz^m$

Will Jagy

26.3k

modified Apr 18 at 16:33

6 votes

2 answers

503 views

Positivity of integral

Carlo Beenakker

195k

modified Apr 24 at 6:08

12 votes

2 answers

673 views

Intersection of ball and a sphere is connected in the normed vector space

Oleksandr Liubimov

551

modified Apr 14 at 19:11

11 votes

2 answers

501 views

Chern classes in Čech cohomology

Konrad Waldorf

4,641

modified Apr 30 at 20:22

8 votes

1 answer

361 views

Is every multiplicative lattice isomorphic to the lattice of ideals of some ring?

Dominic van der Zypen

51.1k

modified Apr 11 at 22:42

6 votes

2 answers

352 views

Does the converse of Schur's lemma hold for smooth representations of finite length of p-adic group?

LSpice

13.5k

modified May 4 at 19:39

8 votes

1 answer

338 views

Is this cyclically pinched one-relator group fully residually free?

HJRW

25.7k

modified Apr 21 at 12:58

3 votes

1 answer

327 views

Solution(s) to $36n^3 - 19 = xy \cdot (y + 2(6n + x))$

LegionMammal978

451

modified yesterday

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