Nice Question - Badge - MathOverflow

Nice Question

Question score of 10 or more. This badge can be awarded multiple times.

Awarded 21643 times.

Is there a universal property characterizing the category of compact Hausdorff spaces?

Awarded 1 hour ago

Georg Lehner

1,70112 silver badges20 bronze badges

Embedding dimension=minimum dimension of a local embedding?

Awarded 17 hours ago

A. Pascal

1,2691 gold badge10 silver badges18 bronze badges

Why do we mainly integrate with respect to martingales?

Awarded 21 hours ago

leo monsaingeon

4,1442 gold badges20 silver badges36 bronze badges

Asymptotic density of provable statements in ZFC

Awarded yesterday

Jason

2,6721 gold badge18 silver badges27 bronze badges

Perfect set property for projective hierarchy

Awarded yesterday

ftonti

3421 silver badge9 bronze badges

Topological rigidity of compact manifolds in dimension three

Awarded yesterday

Shinpei

1331 gold badge1 silver badge5 bronze badges

A Reference for Schubert's Theorem

Awarded yesterday

Owen Sizemore

2,3512 gold badges16 silver badges30 bronze badges

Statements in differential geometry independent from ZFC

Awarded 2 days ago

Pelota

1714 bronze badges

Young-Fibonacci tableaux, content, and the Okada algebra

Awarded Jan 25 at 3:19

A. Leverkuhn

3411 silver badge9 bronze badges

Mean curvature flow and knot theory

Awarded Jan 25 at 2:51

Quarto Bendir

2,1407 silver badges18 bronze badges

Elementary aspects of The Fargues-Fontaine curve

Awarded Jan 24 at 21:06

QGravity

9694 silver badges11 bronze badges

More identities for the Lambert $W$ function

Awarded Jan 24 at 15:04

Henri Cohen

9,65923 silver badges46 bronze badges

The associated prime ideals of $Ext^i_R(M,N)$

Awarded Jan 24 at 9:51

TmobiusX

1,0976 silver badges18 bronze badges

Existence of an open convex set

Awarded Jan 23 at 21:27

Julian

1356 bronze badges

A square root inequality for symmetric matrices?

Awarded Jan 23 at 19:41

leo monsaingeon

4,1442 gold badges20 silver badges36 bronze badges

Computing K-theory for cellular vector bundles

Awarded Jan 23 at 19:41

Vidit Nanda

15k2 gold badges57 silver badges120 bronze badges

A question about an application of Molien's formula to find the generators and relations of an invariant ring

Awarded Jan 23 at 13:57

aglearner

13.7k8 gold badges37 silver badges91 bronze badges

A question about the vanishing of motivic cohomology in negative Tate twist

Awarded Jan 23 at 12:55

user438991

7413 silver badges13 bronze badges

Classifications of finite simple objects

Awarded Jan 22 at 20:17

Qfwfq

22k14 gold badges110 silver badges208 bronze badges

Is the number of "breakthroughs" in mathematics decreasing, as it is claimed to be in other sciences?

Awarded Jan 22 at 12:08

xeng

2372 silver badges6 bronze badges

Theories of truth

Awarded Jan 22 at 1:35

Qfwfq

22k14 gold badges110 silver badges208 bronze badges

A category with weak equivalences which is not a model category

Awarded Jan 21 at 20:26

Fernando

8455 silver badges20 bronze badges

Simpler proofs using the axiom of choice [duplicate]

Awarded Jan 21 at 1:50

coudy

17.5k4 gold badges65 silver badges118 bronze badges

Preschemes and schemes

Awarded Jan 20 at 18:37

Anweshi

7,06211 gold badges70 silver badges96 bronze badges

Results from abstract algebra which look wrong (but are true)

Awarded Jan 20 at 8:19

Martin Brandenburg

58.1k9 gold badges178 silver badges390 bronze badges

Are "étalé spaces" a thing for probability spaces?

Awarded Jan 20 at 5:25

fosco

12k2 gold badges25 silver badges64 bronze badges

Why did Voevodsky abandon his work on "singletons"?

Awarded Jan 19 at 9:21

user514014

2511 silver badge4 bronze badges

A model of pillows

Awarded Jan 19 at 8:56

Daniel Castro

2271 silver badge14 bronze badges

Adams blue book lemma 17.14: computing a $\mathbb{F}_2$ basis for a filtration of $H\mathbb{Z}_*(bu \wedge bu)$

Awarded Jan 19 at 1:35

Francis Baer

1012 bronze badges

Evaluating the sum $f(x):=\sum_{n=1}^\infty \frac{1}{n! n^n}(-x^2)^n$ and estimating bounds

Awarded Jan 19 at 1:17

Isaac

1,2579 silver badges14 bronze badges

Applications of Liouville's theorem

Awarded Jan 19 at 0:51

js21

7,13917 silver badges35 bronze badges

Counting degrees of freedom in Lie algebra structure constants (aka why are there any nontrivial Lie algebras of dim >5?)

Awarded Jan 18 at 23:48

Kensmosis

2851 silver badge4 bronze badges

Topology in non-mathematical literature

Awarded Jan 18 at 15:06

CuriousUser

1,34411 silver badges21 bronze badges

Tensor rank of anti-symmetric tensor

Awarded Jan 18 at 13:46

Klim Efremenko

2,12913 silver badges28 bronze badges

Nontrivial trivial integrals

Awarded Jan 18 at 6:49

Michael Hardy

10.2k10 gold badges73 silver badges109 bronze badges

Axiomatic approach to means

Awarded Jan 17 at 23:50

Yiftach Barnea

5,0882 gold badges34 silver badges47 bronze badges

classifying $\infty$-toposes for topological/localic groups?

Awarded Jan 17 at 18:25

Simon Henry

36.2k3 gold badges92 silver badges179 bronze badges

Universal property of the set of injections in the category of sets

Awarded Jan 17 at 10:25

Madeleine Birchfield

1,6843 silver badges17 bronze badges

How to determine the asymptotics of $\sum_{n=0}^{\infty} e^{-\frac{2^n}{x}}$

Awarded Jan 17 at 9:08

Sidharth Ghoshal

1,4189 silver badges21 bronze badges

Relation between holonomic D-modules and perverse sheaves

Awarded Jan 17 at 6:10

Jan Weidner

12.4k10 gold badges58 silver badges82 bronze badges

When do maximum and expectation commute?

Awarded Jan 16 at 20:00

martin

1111 silver badge6 bronze badges

sSet-enriched categories, quasi-categories and the model-independent theory

Awarded Jan 16 at 14:20

out

1,3551 gold badge5 silver badges25 bronze badges

Mark Hovey's open problems in the theory of model categories

Awarded Jan 16 at 14:20

out

1,3551 gold badge5 silver badges25 bronze badges

How do you see that higher genus surfaces are not homogeneous?

Awarded Jan 16 at 11:19

Simon Willerton

1,2449 silver badges23 bronze badges

Rectifying diagrams of $\infty$-categories

Awarded Jan 16 at 2:25

Mike Shulman

61.4k7 gold badges143 silver badges336 bronze badges

For what kind of $C^*$ algebras does the inequality $\frac{(ab+ba)}{2}\leq\frac{ a^p}{p} +\frac{b^q }{q}$ hold for $a,b>0$?

Awarded Jan 16 at 0:26

Ali Taghavi

3298 gold badges30 silver badges116 bronze badges

Critical dimensions D for "smooth manifolds iff triangulable manifolds"

Awarded Jan 15 at 20:36

wonderich

10.1k3 gold badges24 silver badges59 bronze badges

Condensed / pyknotic approach to orbifolds?

Awarded Jan 14 at 20:12

Tim Campion♦

53.6k10 gold badges122 silver badges306 bronze badges

Are there general principles that allow us to easily determine whether coins in simple arrangements in a frame can move?

Awarded Jan 13 at 19:26

Dan

1,1432 silver badges17 bronze badges

Is there a countably infinite closed interval in the lattice of topologies?

Awarded Jan 13 at 17:35

Will Brian

15.7k3 gold badges63 silver badges92 bronze badges

What is the "iterated definability" limit of first-order logic?

Awarded Jan 13 at 12:26

Noah Schweber

20.2k8 gold badges86 silver badges262 bronze badges

When the restriction of a derived functor to a subcategory is the derived functor of the restriction

Awarded Jan 13 at 7:06

Rami

2,38915 silver badges25 bronze badges

Is the leading Taylor coefficient at $s = 1$ of the $L$-series of an elliptic curve over $\mathbb{Q}$ positive, as predicted by BSD?

Awarded Jan 13 at 4:08

Question Mark

1,0936 silver badges14 bronze badges

Conjecture: If equal size circular coins are in a convex polygonal frame, with each coin touching exactly one edge, then all the coins can move

Awarded Jan 12 at 19:31

Dan

1,1432 silver badges17 bronze badges

Small complete categories in HoTT+LEM

Awarded Jan 12 at 13:27

Amélia Liao

1735 bronze badges

Is there another controversial statement by Grothendieck apart from 57 being prime?

Awarded Jan 12 at 8:40

Georges Elencwajg

45.8k13 gold badges148 silver badges233 bronze badges

Examples of errors in computational combinatorics results

Awarded Jan 12 at 8:06

Jukka Kohonen

3,0922 gold badges10 silver badges42 bronze badges

What does it mean for a differential equation "to be integrable"? [duplicate]

Awarded Jan 12 at 5:32

Simone Gaiarin

2012 silver badges4 bronze badges

How “disconnected” can a continuum be?

Awarded Jan 12 at 2:07

Alessandro Codenotti

2,2511 gold badge15 silver badges24 bronze badges

Grothendieck group of the Fibonacci monoid

Awarded Jan 12 at 1:52

Zerox

9021 gold badge3 silver badges12 bronze badges

2 3 4 5

…

361 Next