Booster - Badge - Mathematics Stack Exchange

Booster

Share a link to a post later visited by 300 unique IP addresses. This badge can be awarded multiple times.

Awarded 770 times.

Math Prerequisites for QFT

Awarded Jul 17 at 22:26

Qmechanic

12.6k2 gold badges42 silver badges111 bronze badges

Is dealing cards till a particular one is seen the same as dealing till the last one

Awarded Jul 6 at 17:11

heckeop

2734 silver badges13 bronze badges

What are the Differences Between a Matrix and a Tensor?

Awarded Jul 4 at 16:21

Mr Tsjolder from codidact

8146 silver badges19 bronze badges

Evaluating the integral $\int_0^\infty \frac{\sin x} x \,\mathrm dx = \frac \pi 2$?

Awarded Jul 4 at 5:09

mickep

20k1 gold badge31 silver badges56 bronze badges

What is the minimum and maximum number of eigenvectors?

Awarded Jun 30 at 16:26

BCLC

13.7k13 gold badges68 silver badges159 bronze badges

Prove that random variables satisfy the inequality $E(XY)^2 \le E(X^2)E(Y^2)$?

Awarded Jun 20 at 20:25

Zoran Loncarevic

1,2731 gold badge9 silver badges12 bronze badges

Conditional independence of events that result in a definite outcome

Awarded Jun 20 at 14:22

heckeop

2734 silver badges13 bronze badges

(Theoretical) Multivariable Calculus Textbooks [duplicate]

Awarded Jun 8 at 12:02

J126

17.5k3 gold badges38 silver badges87 bronze badges

Projection of a vector onto the null space of a matrix

Awarded Jun 6 at 23:43

copper.hat

174k9 gold badges120 silver badges262 bronze badges

Direct approach to the Closed Graph Theorem

Awarded Jun 6 at 21:17

t.b.

78.7k11 gold badges277 silver badges344 bronze badges

Proving that $\left(\mathbb Q[\sqrt p_1,\dots,\sqrt p_n]:\mathbb Q\right)=2^n$ for distinct primes $p_i$.

Awarded Jun 5 at 7:47

Jyrki Lahtonen

135k30 gold badges288 silver badges686 bronze badges

Physical interpretation of Laplace transforms

Awarded Jun 2 at 15:27

jnez71

4,8121 gold badge19 silver badges32 bronze badges

Partial sum of rows of Pascal's triangle

Awarded May 30 at 5:36

Zev Chonoles

131k21 gold badges333 silver badges543 bronze badges

Expected Value of Random Walk

Awarded May 27 at 23:31

draks ...

18.6k8 gold badges66 silver badges194 bronze badges

An entire function $f(z)$ is real iff $z$ is real [duplicate]

Awarded May 26 at 23:21

user1537366

2,1051 gold badge17 silver badges24 bronze badges

Polynomials irreducible over $\mathbb{Q}$ but reducible over $\mathbb{F}_p$ for every prime $p$

Awarded May 17 at 21:33

Jyrki Lahtonen

135k30 gold badges288 silver badges686 bronze badges

Finding Weak Solutions to ODEs

Awarded May 17 at 14:34

Svetoslav

5,2352 gold badges18 silver badges35 bronze badges

Given a commutative ring $R$ and an epimorphism of free modules $R^m \to R^n$ is then $m \geq n$?

Awarded May 16 at 23:50

Pierre-Yves Gaillard

19.9k3 gold badges58 silver badges109 bronze badges

Different ways to prove $\sum_{k=1}^\infty \frac{1}{k^2}=\frac{\pi^2}{6}$ (the Basel problem)

Awarded May 16 at 13:11

FDP

14k1 gold badge40 silver badges58 bronze badges

Functions that are their own Fourier transform

Awarded May 13 at 10:51

Job Bouwman

1,88919 silver badges17 bronze badges

Multiples of an irrational number forming a dense subset

Awarded May 11 at 5:27

Julian Kuelshammer

9,7104 gold badges39 silver badges84 bronze badges

Prove that $n^k < 2^n$ for all large enough $n$

Awarded May 8 at 17:40

Andrés E. Caicedo

79.6k10 gold badges225 silver badges354 bronze badges

Does trivial cohomology imply trivial homology? Does $\operatorname{Hom}(A,\mathbb Z) = \operatorname{Ext}^1(A, \mathbb Z) = 0$ imply $A = 0$?

Awarded Apr 28 at 9:25

Michael Albanese

101k22 gold badges209 silver badges473 bronze badges

How do you create projective plane out of a finite field?

Awarded Apr 28 at 1:35

Jyrki Lahtonen

135k30 gold badges288 silver badges686 bronze badges

Equivalence of morphisms under substitution

Awarded Apr 26 at 0:35

Corbin

3744 silver badges13 bronze badges

Quadratic equations that are unsolvable in any successive quadratic extensions of a field of characteristic 2

Awarded Apr 24 at 20:35

Jyrki Lahtonen

135k30 gold badges288 silver badges686 bronze badges

Construct a function which is continuous in $[1,5]$ but not differentiable at $2, 3, 4$

Awarded Apr 23 at 4:41

MT_

19.7k9 gold badges42 silver badges84 bronze badges

Can $x^{x^{x^x}}$ be a rational number?

Awarded Apr 22 at 5:51

Julio Puerta

8,9394 gold badges11 silver badges34 bronze badges

$n \mid (a^{n}-b^{n}) \ \Longrightarrow$ $n \mid \frac{a^{n}-b^{n}}{a-b}$

Awarded Apr 20 at 2:26

Bill Dubuque

275k40 gold badges308 silver badges961 bronze badges

Closed-form of $\int_0^1 \frac{\ln^2(x)}{\sqrt{x(a-bx)}}\,dx$

Awarded Apr 14 at 19:51

Vladimir Reshetnikov

47.3k9 gold badges164 silver badges301 bronze badges

Interpreting the Cayley-Hamilton theorem

Awarded Apr 5 at 4:10

lhf

218k19 gold badges243 silver badges567 bronze badges

Does Schanuel's conjecture imply that $\pi^e$ is transcendental?

Awarded Mar 11 at 19:04

Akiva Weinberger

23.5k1 gold badge45 silver badges111 bronze badges

Formal proof that $\mathbb{R}^{2}\setminus (\mathbb{Q}\times \mathbb{Q}) \subset \mathbb{R}^{2}$ is connected.

Awarded Mar 11 at 11:34

JDH

44.4k14 gold badges125 silver badges190 bronze badges

Proof general state space similarity transformation to controllable canonical form

Awarded Feb 27 at 22:31

Kwin van der Veen

12.1k2 gold badges20 silver badges49 bronze badges

Show that $\gcd\left(\frac{a^n-b^n}{a-b},a-b\right)=\gcd(n d^{n-1},a-b)$

Awarded Feb 27 at 4:05

Bill Dubuque

275k40 gold badges308 silver badges961 bronze badges

Problem book on differential forms wanted

Awarded Feb 26 at 20:10

Yuri Vyatkin

11.3k2 gold badges42 silver badges69 bronze badges

Evaluating $\sum\limits_{n=2}^{\infty} \frac{1}{ GPF(n) GPF(n+1)}\,$, where $\operatorname{ GPF}(n)$ is the greatest prime factor

Awarded Feb 24 at 12:31

Eric Naslund

72.4k11 gold badges175 silver badges268 bronze badges

The binomial coefficient $n\choose m$ is divisible by $n/\gcd(n,m)$

Awarded Feb 23 at 4:40

Bill Dubuque

275k40 gold badges308 silver badges961 bronze badges

Circle group addition of fractional parts is well-defined

Awarded Feb 22 at 19:48

Bill Dubuque

275k40 gold badges308 silver badges961 bronze badges

In a Hausdorff space the intersection of a chain of compact connected subspaces is compact and connected

Awarded Feb 7 at 6:57

Henno Brandsma

244k10 gold badges125 silver badges272 bronze badges

Reed Solomon Polynomial Generator

Awarded Feb 6 at 7:56

Jyrki Lahtonen

135k30 gold badges288 silver badges686 bronze badges

Properties of the A-transpose-A matrix

Awarded Feb 5 at 20:17

Antoni Parellada

9,0815 gold badges48 silver badges141 bronze badges

'Trace trick' for expectations of quadratic forms

Awarded Feb 2 at 20:46

Joram Soch

1081 silver badge11 bronze badges

Is the matrix square root uniformly continuous?

Awarded Feb 2 at 12:50

Nan Jiang

1111 silver badge4 bronze badges

Martingale that is not a Markov process

Awarded Jan 24 at 21:48

ofey73

1151 silver badge6 bronze badges

Notation for partial derivative of functions of functions

Awarded Jan 20 at 0:30

GKeeter

11 gold badge1 silver badge2 bronze badges

How to check if a point is inside a rectangle?

Awarded Jan 18 at 8:49

AnnieOK

2,9503 gold badges20 silver badges37 bronze badges

$X$ is random variable for which it is valid $E(X^{2})=E(X^{3})=E(X^{4})<\infty$. Prove that X is discrete random variable with values in {0,1} [closed]

Awarded Jan 16 at 22:33

Clement C.

67.7k8 gold badges76 silver badges167 bronze badges

$\sum a_n^3$ converges implies that $\sum \frac{a_n}{n}$ converges?

Awarded Dec 18, 2023 at 2:01

Clement C.

67.7k8 gold badges76 silver badges167 bronze badges

Intuition behind Conditional Expectation

Awarded Dec 12, 2023 at 19:10

D G

5975 silver badges15 bronze badges

Is there any simple set of properties which uniquely characterizes differentiation?

Awarded Dec 5, 2023 at 1:18

diracdeltafunk

15.7k3 gold badges29 silver badges54 bronze badges

List of explicit enumerations of rational numbers [closed]

Awarded Dec 1, 2023 at 22:25

Asaf Karagila♦

397k46 gold badges617 silver badges1k bronze badges

Associativity of product measures

Awarded Nov 26, 2023 at 4:03

balu

4434 silver badges17 bronze badges

Show that $P(A\mid B) > P(A\mid B^{c}) \implies P(B\mid A) > P(B\mid A^{c})$

Awarded Nov 24, 2023 at 20:26

heckeop

2734 silver badges13 bronze badges

Expected number of tosses for two coins to achieve the same outcome for five consecutive flips

Awarded Nov 22, 2023 at 4:25

Mike Spivey

55.8k17 gold badges182 silver badges282 bronze badges

Pedagogy: How to cure students of the "law of universal linearity"?

Awarded Nov 18, 2023 at 6:48

fedorqui

1111 silver badge7 bronze badges

Expected time till absorption in specific state of a Markov chain

Awarded Nov 12, 2023 at 23:49

Terence C

3322 silver badges9 bronze badges

What is the most cited mathematical paper?

Awarded Oct 31, 2023 at 14:21

Clement C.

67.7k8 gold badges76 silver badges167 bronze badges

Advanced algebraic topology topics overview

Awarded Oct 30, 2023 at 14:35

t.b.

78.7k11 gold badges277 silver badges344 bronze badges

What is a topology?

Awarded Oct 26, 2023 at 23:16

John McCarthy

111 silver badge3 bronze badges

2 3 4 5

…

13 Next