Nice Question - Badge - Mathematics Stack Exchange

Nice Question

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

Awarded 43520 times.

Topologies on an arbitrary set that only depend on this set

Awarded Oct 23 at 1:50

Amaru

3391 silver badge7 bronze badges

Why isn't math completely solved by expert systems? [duplicate]

Awarded Oct 23 at 1:03

Hector Babeco

1013 bronze badges

To show a morphism of affine k-varieties which is surjective on closed points is surjective

Awarded Oct 22 at 18:52

Ben

3,7881 gold badge24 silver badges37 bronze badges

How to prove $f(x)=ax$ if $f(x+y)=f(x)+f(y)$ and $f$ is locally integrable

Awarded Oct 22 at 14:27

89085731

7,9825 gold badges38 silver badges83 bronze badges

What is $ {n\choose k}$?

Awarded Oct 22 at 4:38

werealreadythere

1191 gold badge1 silver badge5 bronze badges

Numerical methods book

Awarded Oct 22 at 3:20

Potato

41.7k21 gold badges145 silver badges292 bronze badges

Manifolds and Charts

Awarded Oct 22 at 2:48

Gold

28.4k21 gold badges115 silver badges214 bronze badges

How should I write proofs requiring complicated, yet routine, symbolic manipulation?

Awarded Oct 21 at 21:05

SRobertJames

6,4611 gold badge12 silver badges44 bronze badges

An intuitive way to understand the Jacobi's formula.

Awarded Oct 21 at 19:46

BigbearZzz

15.7k3 gold badges35 silver badges95 bronze badges

Solving $x^p + y^p = p^z$ in positive integers $x,y,z$ and a prime $p$

Awarded Oct 21 at 18:21

Chris

5,0001 gold badge29 silver badges60 bronze badges

K Theory: Book Recommendations

Awarded Oct 21 at 18:05

StormyTeacup

2,27013 silver badges21 bronze badges

Curvature and torsion of a spherical curve

Awarded Oct 21 at 14:10

pedro

1516 bronze badges

Roots of a polynomial dividing a binomial $x^n - a$

Awarded Oct 21 at 5:07

Heraklit

3313 silver badges11 bronze badges

How to prove $\inf(S)=-\sup(-S)$?

Awarded Oct 21 at 4:36

Tom

1,1295 gold badges12 silver badges21 bronze badges

$\operatorname{arsinh}$ vs $\operatorname{arcsinh}$

Awarded Oct 21 at 3:36

Argon

26k13 gold badges103 silver badges144 bronze badges

Showing that a $1:\sqrt{2}:2$ triangle can be inscribed in a regular heptagon in this way

Awarded Oct 21 at 1:40

svj

Decomposition of a $K$-linear map under the field extension $L/K$

Awarded Oct 21 at 1:22

scripher

4071 silver badge10 bronze badges

integrate $F(x)$: NO complex analysis, NO multivariable calculus

Awarded Oct 20 at 20:27

Chris Sanders

7,61211 silver badges26 bronze badges

Tensor product of two chain homotopic maps are again chain homotopic

Awarded Oct 20 at 19:15

Cheng

1013 bronze badges

What About The Converse of Lagrange's Theorem?

Awarded Oct 20 at 18:42

Saaqib Mahmood

27.8k14 gold badges77 silver badges271 bronze badges

Automorphism group of a topological space

Awarded Oct 20 at 15:47

Dominic van der Zypen

2,86814 silver badges24 bronze badges

Can the idea of a 'total differential' be formalized using non-standard analysis?

Awarded Oct 20 at 15:13

Anna

1,0523 silver badges14 bronze badges

Which space do we obtain if we take a Möbius strip and identify its boundary circle to a point?

Awarded Oct 20 at 12:46

Antimony

3,48310 silver badges29 bronze badges

How to sample a binomial random variable?

Awarded Oct 20 at 11:00

UndeadKernel

2032 silver badges6 bronze badges

Limit of $\sum_{k=1}^{n-1} \frac{1}{2^n}\binom{n}{k}\log_2\!\left(\frac{n}{k}\right)$

Awarded Oct 20 at 5:24

Philip G.

1155 bronze badges

Why doesn't $\int\lfloor {x}\rfloor~dx=x\lfloor x\rfloor +C$?

Awarded Oct 20 at 5:19

A-Level Student

6,9142 gold badges18 silver badges48 bronze badges

Planar geometry problems solved by thinking out of the plane

Awarded Oct 19 at 18:46

Dan

40.3k5 gold badges83 silver badges247 bronze badges

When and why do products preserve pushouts?

Awarded Oct 19 at 15:20

Julian Kniephoff

3951 silver badge12 bronze badges

Prove that $\int_0^1\frac{dx}{\sqrt{4x^5+1}}=\frac{\Gamma(\frac 3{10})\Gamma(\frac 65)}{2^{2/5}\Gamma(\frac 12)}\frac{5+\sqrt 5}{10}$

Awarded Oct 19 at 15:07

cybcat

1,0644 silver badges14 bronze badges

Fermat's Last Theorem ($n=4$) using the Gaussian integers

Awarded Oct 19 at 13:00

cansomeonehelpmeout

14.3k3 gold badges31 silver badges60 bronze badges

A closed form of the integral $\int_{0}^{\infty}\arcsin\left(\frac{\sin\left(x\right)}{x}\right)dx$

Awarded Oct 19 at 11:26

d ds

1,3762 silver badges24 bronze badges

Where is the inconsistentency hiding in Langley's adventitious angle?

Awarded Oct 18 at 14:09

Virender Bhardwaj

1531 silver badge8 bronze badges

Let $f: \Bbb R \to \Bbb R$ be a differentiable function such that $\sup_{x \in \Bbb R}|f'(x)| \lt \infty$. Then

Awarded Oct 18 at 5:53

Error 404

6,0563 gold badges30 silver badges62 bronze badges

What is the difference between Tautochrone curve and Brachistochrone curve as both are cycloid?

Awarded Oct 17 at 15:54

Victor

8,5687 gold badges58 silver badges116 bronze badges

Axiom of irrelevant choice?

Awarded Oct 17 at 14:41

Vincent

11.5k2 gold badges23 silver badges58 bronze badges

The rank of skew-symmetric matrix is even

Awarded Oct 17 at 13:31

itsme

1091 gold badge1 silver badge3 bronze badges

Dirac Delta function

Awarded Oct 17 at 12:50

Ringo

1731 silver badge7 bronze badges

Cuntz algebra and Schur-Weyl duality

Awarded Oct 17 at 11:07

Mykola Pochekai

1,80412 silver badges27 bronze badges

Checking: Have I found all solutions to this functional equation?

Awarded Oct 16 at 19:35

Will.Octagon.Gibson

1,6978 silver badges25 bronze badges

A $p$-biased centered random walk never leaves $[-1,1]$ with probability $\ge e^{-np(1-p)}$.

Awarded Oct 16 at 17:24

Thomas Ahle

5,91529 silver badges57 bronze badges

Difference between Fritz John and Karush-Kuhn-Tucker conditions

Awarded Oct 16 at 16:42

slhck

2372 silver badges8 bronze badges

How to prove that every orthogonal matrix has determinant $\pm1$ using limits (Strang 5.1.8)?

Awarded Oct 16 at 8:47

HiMatt

1,5619 silver badges26 bronze badges

Evaluate $\int _0^1\int _0^1\int _0^1\frac{xy^2z}{\left(x^2+yz\right)\left(z^2+yx\right)}dxdydz$

Awarded Oct 16 at 3:00

Random Math Enthusiast

3,0257 silver badges33 bronze badges

Evaluate definite integral $\int_0^1 \frac{\tanh^{-1} x}{\sqrt{1+x^2}}dx$

Awarded Oct 16 at 3:00

Ace

2,9581 gold badge6 silver badges20 bronze badges

Total numbers of paths in a grid without any restrictions

Awarded Oct 16 at 1:10

mlg

3622 silver badges13 bronze badges

Euler-Poisson-Darboux equation - PDE Evans

Awarded Oct 15 at 21:01

the_firehawk

2,5144 gold badges21 silver badges42 bronze badges

Solve $x^{3}-3x=\sqrt{x+2}$

Awarded Oct 15 at 20:42

Henry

5,8873 gold badges30 silver badges72 bronze badges

Approximations and bounds for numbers $n$ such that the sum of digits of $k^n > k$ (A305706).

Awarded Oct 15 at 20:33

Shreyansh Jaiswal

3502 silver badges16 bronze badges

Meaning of restriction of a vector field on a submanifold

Awarded Oct 15 at 20:07

Weltschmerz

7,1984 gold badges39 silver badges53 bronze badges

Motivation for Spectral Sequences

Awarded Oct 15 at 14:37

user1072285

8854 silver badges10 bronze badges

Definition of $H^{-1}$ space in Evans' PDE book

Awarded Oct 15 at 14:11

user142700

3,04019 silver badges44 bronze badges

Additive functor is exact $\iff$ quasi-isomorphisms preserved?

Awarded Oct 15 at 12:48

Danielle Intal

6418 silver badges12 bronze badges

Any convex set is connected

Awarded Oct 15 at 9:43

sequence

10.1k13 gold badges65 silver badges168 bronze badges

Classification of analytic involutions

Awarded Oct 15 at 9:43

Alexey

2,78619 silver badges33 bronze badges

Expected value of the maximum minimum set

Awarded Oct 15 at 4:26

Erel Segal-Halevi

11.6k4 gold badges47 silver badges117 bronze badges

What planar convex shape maximizes the probability that a random circle contains the centre? (Surprisingly, it's not a disk.)

Awarded Oct 14 at 22:56

Dan

40.3k5 gold badges83 silver badges247 bronze badges

Cardinal number subtraction

Awarded Oct 14 at 21:42

MathematicalOrchid

6,4855 gold badges35 silver badges51 bronze badges

Galois action on character group

Awarded Oct 14 at 11:02

user10676

8,6712 gold badges34 silver badges53 bronze badges

Ellipsoid contained in another ellipsoid: geometric proof of an inequality?

Awarded Oct 14 at 8:08

Lee

12k2 gold badges18 silver badges44 bronze badges

What is the interpretation of homogeneous line intersection?

Awarded Oct 14 at 1:11

Stack crashed

2732 silver badges11 bronze badges

Prev 1 2 3

…

726 Next