Notable Question

Question with 2,500 views. This badge can be awarded multiple times.

Awarded 9916 times.

Maximum number of edges in bipartite graph without cycles of length 4

Awarded Oct 26 at 19:11

Ilya

2714 silver badges10 bronze badges

Proving Mertens' theorem using the prime number theorem

Awarded Oct 26 at 10:45

Daniel Loughran

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Can every surface be realized as a mean convex hypersurface in $\mathbb{R}^3$?

Awarded Oct 26 at 2:49

JMK

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Axiom of choice: ultrafilter vs. Vitali set

Awarded Oct 25 at 19:26

Stefan Geschke

16.6k2 gold badges57 silver badges83 bronze badges

Stable homotopy theory and physics

Awarded Oct 25 at 11:37

Sasha

3213 silver badges4 bronze badges

How many random walk steps until the path self-intersects?

Awarded Oct 24 at 17:21

Joseph O'Rourke

153k36 gold badges374 silver badges1k bronze badges

Counting categories with at most $n$ morphisms

Awarded Oct 24 at 13:02

Espen Nielsen

7687 silver badges18 bronze badges

Shelah's book on "Classification Theory"

Awarded Oct 24 at 6:46

Ali V.

2513 silver badges9 bronze badges

Existence of point with zero mean curvature

Awarded Oct 24 at 3:10

geooranalysis

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Cross variation two not independent Brownian motions

Awarded Oct 23 at 2:45

Maggie

231 silver badge4 bronze badges

Banach-Mazur distance between $\ell^p$-norms

Awarded Oct 23 at 1:10

Denis Serre

53.1k10 gold badges153 silver badges316 bronze badges

What is the correct notion of Morita Equivalence between topological groupoids

Awarded Oct 22 at 21:50

Werner Thumann

1,5601 gold badge11 silver badges21 bronze badges

Derivations on the continuous functions of a manifold

Awarded Oct 22 at 13:17

Dave Shulman

9697 silver badges16 bronze badges

A careful roadtrip from locally symmetric spaces to algebra

Awarded Oct 21 at 20:18

Saal Hardali

7,9993 gold badges48 silver badges104 bronze badges

The symmetric power of a tensor product

Awarded Oct 21 at 9:27

eti902

9416 silver badges22 bronze badges

Transforming a non-invertible matrix into an invertible matrix

Awarded Oct 21 at 8:50

Dudi Frid

2652 silver badges9 bronze badges

$A \wedge A \wedge A$ in Chern-Simons

Awarded Oct 21 at 2:31

N. Shimode

1431 silver badge7 bronze badges

On Q-Cartier Divisors

Awarded Oct 20 at 11:05

Pierre MATSUMI

7914 silver badges12 bronze badges

Derivations of C(X)? or Why Must Supermanifolds be Smooth?

Awarded Oct 20 at 6:47

Chris Schommer-Pries

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Cohomology of $G_3(\mathbb{R}^5)$

Awarded Oct 20 at 4:47

Mark Grant

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Several questions about Gauss's mathematical conception of braids

Awarded Oct 19 at 17:48

user2554

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Dimensions of irreducible representations of $GL(n,F_q)$ are polynoms in q having roots ONLY at roots of unity and zero?

Awarded Oct 19 at 15:26

Alexander Chervov

26.3k20 gold badges113 silver badges223 bronze badges

Model structure of commutative dg-algebras inside all dg-algebras

Awarded Oct 19 at 7:47

Urs Schreiber

21.1k1 gold badge77 silver badges287 bronze badges

Prime Number Theorem w/o Complex Analysis

Awarded Oct 19 at 5:31

LowerBounds

6939 silver badges22 bronze badges

Infinitely many prime numbers of the form $n^{2^k}+1$?

Awarded Oct 18 at 14:12

Portland

2,85925 silver badges35 bronze badges

Chromatic number of graphs of tangent closed balls

Awarded Oct 18 at 14:12

Kristal Cantwell

6,6311 gold badge28 silver badges45 bronze badges

How many distinct homeomorphism classes of lens spaces are there with a fixed p?

Awarded Oct 18 at 14:12

Anna Alexandrov

611 silver badge3 bronze badges

Listing lattice points in a simplex

Awarded Oct 18 at 13:12

John Voight

3,04922 silver badges28 bronze badges

Homology of lens spaces using Morse theory?

Awarded Oct 18 at 12:52

john mangual

23.3k5 gold badges71 silver badges181 bronze badges

Gradient of Wasserstein distance in the sense of Otto's calculus

Awarded Oct 18 at 8:08

MikeG

7757 silver badges17 bronze badges

Deformation quantization and quantum cohomology (or Fukaya category) -- are they related?

Awarded Oct 17 at 15:51

Kevin H. Lin

21.6k10 gold badges124 silver badges191 bronze badges

K-theory and K-theory pushforward in topology vs. in algebraic geometry

Awarded Oct 17 at 12:05

Kevin H. Lin

21.6k10 gold badges124 silver badges191 bronze badges

Concrete examples of noncongruence, arithmetic subgroups of SL(2,R)

Awarded Oct 17 at 9:21

Marc Palm

11.3k2 gold badges39 silver badges97 bronze badges

Ordering of large cardinals by cardinality

Awarded Oct 17 at 9:21

Cosmonut

8317 silver badges13 bronze badges

Are any natural examples of Gödel speed-up known?

Awarded Oct 17 at 8:37

John Stillwell

12.6k16 gold badges99 silver badges121 bronze badges

Sum of difference moduli vs. sum of modulus differences

Awarded Oct 17 at 8:37

darij grinberg

35.5k4 gold badges125 silver badges268 bronze badges

Singmaster's conjecture

Awarded Oct 17 at 6:55

Michael Hardy

12.8k12 gold badges90 silver badges131 bronze badges

Question on a generalisation of a theorem by Euler

Awarded Oct 17 at 6:45

Dominic van der Zypen

53.6k9 gold badges53 silver badges192 bronze badges

About weak convergence of probability measure

Awarded Oct 17 at 6:26

Xiao Cao

711 silver badge3 bronze badges

The Fourier Transform of taking Eigenvalues

Awarded Oct 17 at 5:38

Gil Kalai

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Time for Langton's ant to cover a "square" torus

Awarded Oct 17 at 3:47

Sebastien Palcoux

27.6k5 gold badges81 silver badges203 bronze badges

A "meta-mathematical principle" of MacPherson

Awarded Oct 17 at 3:25

Faisal

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Is there a version of the Poincaré–Hopf theorem for manifold with corners?

Awarded Oct 16 at 18:36

Ya He

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maximal subgroups of finite simple groups

Awarded Oct 16 at 18:05

sebastian

5073 silver badges11 bronze badges

Alternative or reprint of Carter's "Finite Groups of Lie Type: Conjugacy Classes and Complex Characters"

Awarded Oct 15 at 19:20

Gro-Tsen

38.2k7 gold badges106 silver badges459 bronze badges

Eichler-Shimura isomorphism and mixed Hodge theory

Awarded Oct 15 at 10:03

algori

24.5k3 gold badges105 silver badges162 bronze badges

Number of involutions in a finite group [closed]

Awarded Oct 15 at 6:30

zizo

671 silver badge2 bronze badges

How to interpret couplings in optimal transport?

Awarded Oct 14 at 22:49

vaoy

3292 silver badges9 bronze badges

Sphere with bounded curvature

Awarded Oct 14 at 13:56

Anton Petrunin

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Is an ambiguity set with Wasserstein distance of order 1 is convex?

Awarded Oct 14 at 12:57

SYLee

611 silver badge4 bronze badges

Do plane projections determine a convex polytope?

Awarded Oct 14 at 12:15

Igor Pak

17.4k3 gold badges66 silver badges125 bronze badges

A long-lasting conjecture of Pólya & Szegő

Awarded Oct 14 at 10:49

BigM

1,5931 gold badge15 silver badges31 bronze badges

Number of Totally Isotropic Subspaces

Awarded Oct 14 at 5:40

Bobby Miraftab

1931 silver badge6 bronze badges

Producing finite objects by forcing!

Awarded Oct 13 at 20:51

Mohammad Golshani

33.5k3 gold badges104 silver badges208 bronze badges

3 square theorem

Awarded Oct 13 at 15:18

t.k

3454 silver badges8 bronze badges

Is there a good notion of `Separated Stack'?

Awarded Oct 13 at 12:31

Chris Schommer-Pries

28.7k3 gold badges98 silver badges180 bronze badges

When do flat holomorphic connections exist?

Awarded Oct 13 at 5:42

Ben C

4,40012 silver badges30 bronze badges

Equations for an algebraic gömböc

Awarded Oct 12 at 12:57

Roland Bacher

18.4k3 gold badges48 silver badges116 bronze badges

Best formulation of Riemann hypothesis for a general audience

Awarded Oct 12 at 3:50

Thomas Ernst

3992 silver badges4 bronze badges

Why the unreasonable applicability of complex numbers in physics/engineering? [duplicate]

Awarded Oct 11 at 11:24

Abhijeet Melkani

1892 silver badges10 bronze badges

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