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Revival

Answer more than 30 days after a question was asked as first answer scoring 2 or more. This badge can be awarded multiple times.

Awarded 18774 times.

Precise statement of Number Avoidance Theorem in game theory

Awarded 1 hour ago

Lily Chung

3,6283 gold badges15 silver badges22 bronze badges

Problem $3.13$ - Character theory of finite groups (M. Isaacs)

Awarded 3 hours ago

Nicky Hekster

45.8k8 gold badges58 silver badges99 bronze badges

What does $\frac{X_n}n$ converge to in distribution for $X_n \sim \chi^2_n$?

Awarded 6 hours ago

Oliver Díaz

33.8k4 gold badges39 silver badges87 bronze badges

Proving Diamond & Shurman Exercise 3.6.4, the dimension formula for cusp forms of weight 1.

Awarded 7 hours ago

Kevin Zheng

6662 silver badges10 bronze badges

Explanation of a proof from Stacks Project: Noetherian ring of formal powers series

Awarded 8 hours ago

yoyo

9,02926 silver badges38 bronze badges

Relation between Morse number and Heegaard number

Awarded 11 hours ago

Nikhil Sahoo

1,5407 silver badges19 bronze badges

Can we find prime numbers with any sum of digits (except those divisible by three)

Awarded 12 hours ago

Erick Wong

24.7k3 gold badges34 silver badges88 bronze badges

What is the largest variety of ring-like algebras in which the additive identity is absorbing, without it being an axiom?

Awarded 12 hours ago

Keith Kearnes

12.3k1 gold badge15 silver badges41 bronze badges

Canonical morphism of dualizing sheaves under normalization.

Awarded 13 hours ago

Invariance

1,6408 silver badges21 bronze badges

Invariance of determinant of metric tensor

Awarded 16 hours ago

Giuseppe Negro

31.1k6 gold badges64 silver badges217 bronze badges

Non-autonomous linear difference inequation

Awarded 17 hours ago

Varun Vejalla

8,1632 gold badges10 silver badges44 bronze badges

$\frac{7}{n}$ as a sum of three unit fractions

Awarded 23 hours ago

Rosie F

2,7142 gold badges10 silver badges28 bronze badges

Corresponding angles of $\square ABCD$ and $\square PQRS$ are equal, $AB=PQ$, $CD=SR$, $AD\not\parallel BC$; prove the quadrilaterals congruent

Awarded yesterday

Alok Dhar Dubey

212 bronze badges

Is the number satisfying $\eta=\sin(\cos(\eta))$ transcendental?

Awarded yesterday

Gerry Myerson

173k12 gold badges204 silver badges371 bronze badges

Ore's Theorem - Graph Theory

Awarded yesterday

Tharindu Sathischandra

4613 silver badges15 bronze badges

What are the different types of "averages" and when to use each one?

Awarded yesterday

Gerry Myerson

173k12 gold badges204 silver badges371 bronze badges

Why on average, is $A[j]$ smaller than half of the elements of $A[1\dots j]$

Awarded yesterday

David K

92.4k8 gold badges76 silver badges202 bronze badges

Integral $\int \frac1{\sqrt {(a x + b) (p x + q)}}dx$

Awarded 2 days ago

Quanto

86.7k7 gold badges95 silver badges183 bronze badges

Isomorphism of meromorphic function fields implies Riemann surfaces are isomorphic

Awarded 2 days ago

psl2Z

1,1281 silver badge11 bronze badges

A separable $C^*$ algebra which contains all separable $C^*$ algebras.

Awarded 2 days ago

the good mr. square

14.9k1 gold badge13 silver badges42 bronze badges

Calculate the ML estimate in multinomial distribution

Awarded 2 days ago

Mochizuki_Mk19

808 bronze badges

Examples of proper loops in $\mathbb{R}$

Awarded Jun 5 at 19:43

tree detective

1,7821 gold badge11 silver badges15 bronze badges

Why Frucht's Theorem is only true for Finite Groups?

Awarded Jun 5 at 17:56

Wannes De Maeyer

1116 bronze badges

Winding numbers are continuous: The proof was too easy

Awarded Jun 5 at 17:15

mmcfa

1038 bronze badges

There exist an integral ideal prime to a given nonzero integral ideal

Awarded Jun 5 at 16:37

Z Wu

1,5378 silver badges14 bronze badges

Hyperboloidal compactification of massive scalar wave equation

Awarded Jun 5 at 12:25

Anıl

365 bronze badges

What does "Ergodic Convergence Rate" mean?

Awarded Jun 5 at 9:28

smz

2311 silver badge9 bronze badges

Simplifying $\sqrt[3]{a\pm\sqrt{b}}$

Awarded Jun 4 at 17:11

RDK

2,4891 gold badge7 silver badges29 bronze badges

Does $\bigcap^{\infty}_{k=0} (I + (X^k)) = I$ hold in a ring of formal power series?

Awarded Jun 4 at 9:41

Acrobatic

8262 silver badges9 bronze badges

Is numerical equivalence preserved by base change to an algebraically closed field?

Awarded Jun 4 at 5:45

Ravi Vakil

1213 bronze badges

Indefinite integral of $\frac{\sqrt{ 25x^2 - 4}}{x}$

Awarded Jun 3 at 20:49

Quanto

86.7k7 gold badges95 silver badges183 bronze badges

Does this categorical quotient exist?

Awarded Jun 3 at 16:27

alvaro rittatore

362 bronze badges

Is there a mathematical symbol for "the value grows"?

Awarded Jun 3 at 12:56

mathandy

4112 silver badges11 bronze badges

Find all group of order $20$ which is a semidirect product of a cyclic group of order $4$ by a cyclic group of order $5$

Awarded Jun 3 at 8:16

citadel

1,7951 gold badge2 silver badges18 bronze badges

Arithmetic-geometric mean of 3 numbers

Awarded Jun 3 at 3:41

Max

4193 silver badges14 bronze badges

Evaluating improper integral $ \int_a^b \frac{dt}{\sqrt{(b-t)(t-a)}} $

Awarded Jun 2 at 15:41

Quanto

86.7k7 gold badges95 silver badges183 bronze badges

Solutions of Triangles inequalities - Duplicate

Awarded Jun 2 at 10:42

Esgeriath

1,5743 silver badges22 bronze badges

Introductory book on Group Theory for physicists

Awarded Jun 1 at 21:19

user

19310 bronze badges

Is there a decent notion of "double Lawvere theory?"

Awarded Jun 1 at 21:19

varkor

3,93713 silver badges22 bronze badges

What are relative integers

Awarded Jun 1 at 16:40

Louis LC

1213 bronze badges

What is a bispectrum analysis?

Awarded Jun 1 at 0:50

SuperPomax

485 bronze badges

$g_1,g_2 \in G$ such that for any complex character $\chi$ , $\chi (g_1)=\chi(g_2)$ ; does $g_1,g_2$ belong to same conjugacy class?

Awarded May 31 at 22:36

Nicky Hekster

45.8k8 gold badges58 silver badges99 bronze badges

Exercise 4.13 in Brezis: L1 limit

Awarded May 31 at 18:32

thanderhop

314 bronze badges

Find $\displaystyle \min_{f \in \mathcal{A}} \int_{0}^{1} (1+x^{2})(f(x))^{2} dx $

Awarded May 31 at 8:42

Gerd

5,0241 gold badge3 silver badges19 bronze badges

Does finding slope of the tangent line to $y=x^2 +2x$ constitute division by zero when differentiating from first principles?

Awarded May 31 at 3:40

FD_bfa

3,6364 gold badges10 silver badges41 bronze badges

Irreducible components of fiber bundle

Awarded May 31 at 3:40

Seth

9,1431 gold badge24 silver badges62 bronze badges

What does "$P$ only if $Q$" tell us about the dependence and implication between $P$ and $Q$?

Awarded May 31 at 0:28

FD_bfa

3,6364 gold badges10 silver badges41 bronze badges

Hauptmoduls for modular curves

Awarded May 30 at 23:47

Tristan Phillips

5424 silver badges13 bronze badges

"Moral" difference between Poincare and Sobolev inequalities

Awarded May 30 at 22:21

Gio67

19.2k1 gold badge15 silver badges41 bronze badges

Optimality — Hamilton-Jacobi-Bellman (HJB) versus Riccati

Awarded May 30 at 20:17

A. Pesare

7212 silver badges11 bronze badges

Solve differential equation $y(t)=1-\int_{0}^t s\cdot y^2(s)~ds$

Awarded May 30 at 17:35

MathFail

18.2k2 gold badges17 silver badges50 bronze badges

Deriving curvature tensor from parallel transport

Awarded May 30 at 10:26

Maen Salman

1018 bronze badges

Properties of Tensor Products (Tsirelson’s inequality)

Awarded May 30 at 4:22

Rehaan Ahmad

2051 silver badge9 bronze badges

How to show $t \mapsto E[Z|\mathscr{F}_t]$ is a.s. borel measurable.

Awarded May 29 at 23:56

Russ Lyons

1906 bronze badges

Which Schauder bases of $F[[x]]$ have the multiplication property?

Awarded May 29 at 12:27

Anon

462 bronze badges

How many ways are there to color the walls of a pentagonal room using five different colors, so that no two non-adjacent walls have the same color?

Awarded May 29 at 12:11

TheBestMagician

2,4876 silver badges17 bronze badges

SDE with stationary Log-normal distribution

Awarded May 28 at 22:26

Kurt G.

9,59814 gold badges12 silver badges26 bronze badges

Book similar to Berkeley Problems in Mathematics

Awarded May 28 at 21:47

Paulo Ney

3973 silver badges11 bronze badges

Orthogonality of first and second kinds of solutions of Bessel's equation.

Awarded May 28 at 20:33

Michael Levy

9326 silver badges20 bronze badges

Tail Lower Bounds using Moment Generating Functions

Awarded May 28 at 18:57

Thomas Ahle

4,34821 silver badges41 bronze badges

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