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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 23076 times.

Proving Hermite's Identity in a different approach

Awarded Oct 9 at 16:02

Prince Nagar

255 bronze badges

Are the poles of the resolvent of a Hermitian operator real?

Awarded Oct 9 at 11:13

Disintegrating By Parts

92.5k6 gold badges78 silver badges172 bronze badges

Evaluate$\int_0^1 \frac{\operatorname{arctanh}^2\left(x^2\right) \log^2(x)}{1 +x^2} \mathrm dx$

Awarded Oct 9 at 2:24

Jorge Layja

Extending functions on (embedded) submanifolds

Awarded Oct 8 at 21:55

Yan Zhu

8635 silver badges20 bronze badges

Homework Stokes' theorem

Awarded Oct 8 at 18:51

user170231

27.1k3 gold badges49 silver badges96 bronze badges

why is a polynomial curve that lies on the x axis known as a double zero

Awarded Oct 8 at 5:17

David K

111k10 gold badges91 silver badges250 bronze badges

Why does the Gaussian function has an additional factor of 1/2 in the exponent?

Awarded Oct 8 at 4:57

φπατηαρ

213 bronze badges

Evaluating $\int\text{e}^{-ax^2 } \operatorname{erf}(bx + c) dx$

Awarded Oct 7 at 20:07

Przemo

12.1k1 gold badge26 silver badges58 bronze badges

Eigenvectors of Laplacian matrix of path graph

Awarded Oct 7 at 17:23

Alex

463 bronze badges

The existence of the Menger curvature of a closed convex curve.

Awarded Oct 7 at 14:35

Nicolas

4,3552 gold badges16 silver badges28 bronze badges

(Upper bound on) Tree width of an $n \times n$ grid graph

Awarded Oct 7 at 13:41

Sergio GGG

313 bronze badges

How to evaluate $-\sum_{n=0}^{\infty} \frac{4^n}{\left( (2n+1) \binom{2n}{n} \right)^2} \frac{H_{n+1}}{n+1}$

Awarded Oct 7 at 2:49

Jorge Layja

Complex Least Squares With Magnitude Equality Constraints

Awarded Oct 7 at 0:38

Royi

10.6k8 gold badges56 silver badges118 bronze badges

Torsion free modules, free modules

Awarded Oct 6 at 23:55

NotaChoice

1,1126 silver badges18 bronze badges

Is the following statement about polynomial approximation of non-differentiable functions true?

Awarded Oct 6 at 15:52

btilly

3,2431 gold badge21 silver badges19 bronze badges

Short exact sequence makes exact triangle in derived category

Awarded Oct 6 at 14:23

Elías Guisado Villalgordo

5,19517 silver badges44 bronze badges

Analytic Continuation of the Riemann Zeta Function via Contour Integration

Awarded Oct 6 at 13:14

Nightmare Integral

918 bronze badges

Evaluation of a Digamma Integral

Awarded Oct 6 at 3:37

Maxime Jaccon

5,3091 gold badge6 silver badges45 bronze badges

Does there exist a closed form for $\int_0^{\pi/2}\frac{x^2\ \text{Li}_2(\sin^2x)}{\sin x}dx$?

Awarded Oct 6 at 2:31

Jorge Layja

Quality of Videos Lectures and Lectures vs Textbooks

Awarded Oct 5 at 21:47

Nothing

1,7681 gold badge15 silver badges33 bronze badges

Concerning the standard decomposition of $S^3$

Awarded Oct 5 at 21:47

C Squared

3,8181 gold badge12 silver badges38 bronze badges

Finding the integral of the natural log to a high power

Awarded Oct 5 at 15:02

R. J. Mathar

4,9836 silver badges19 bronze badges

Stalks of an inverse image sheaf are same as the stalks (using adjoints)

Awarded Oct 4 at 21:06

Infty547

1087 bronze badges

How to show that the structure constant of SU(3) is invariant?

Awarded Oct 4 at 13:32

Cosmas Zachos

6,2931 gold badge16 silver badges46 bronze badges

Extending compass and straightedge construction with pins and strings.

Awarded Oct 4 at 13:32

BaileyA

1631 silver badge7 bronze badges

Subgroups of $S_n$ with all non-trivial elements of same cycle type.

Awarded Oct 4 at 8:55

Joshua P. Swanson

12.3k19 silver badges40 bronze badges

Calculate Limit of Lebesgue Integral: $\lim_{n \rightarrow \infty} \int^1_0 \frac{1}{1+\cos^{2n}(x+n)} dx$

Awarded Oct 3 at 22:33

Calvin Khor

36.6k6 gold badges48 silver badges105 bronze badges

Geometric intuition for limit of $\frac{1-\cos x}{x}$ as $x \to 0$

Awarded Oct 3 at 21:50

William Rose

1662 silver badges7 bronze badges

How does base change affect group schemes?

Awarded Oct 3 at 15:07

Kazuki Sato

5352 silver badges10 bronze badges

Is conditional entropy ever taken to be a random variable?

Awarded Oct 3 at 14:31

Bernhard

1,1916 silver badges10 bronze badges

Solving $(n+1)!-1 \ge 10^9$

Awarded Oct 2 at 7:19

fleablood

134k5 gold badges56 silver badges148 bronze badges

Inequality problem with factorials

Awarded Oct 2 at 6:03

Yizhen Chen

1,1428 silver badges19 bronze badges

Approximation of measurable function by step functions

Awarded Oct 2 at 4:00

Akos

292 bronze badges

Problem 30 in the Exercises following Chapter 2 in Baby Rudin: How to immitate the proof of Theorem 2.43?

Awarded Oct 1 at 20:01

biswajit rajaguru

213 bronze badges

Surface integral: Cone cut by a cylinder

Awarded Oct 1 at 18:27

JimmyK4542

56.1k3 gold badges86 silver badges150 bronze badges

Show that $\displaystyle\lim_{n \to \infty} \frac{1!\cdot2!\cdot\dots\cdot n!}{(2n)!} = \infty$

Awarded Oct 1 at 9:45

2'5 9'2

57.7k8 gold badges90 silver badges165 bronze badges

Bernoulli polynomials properties

Awarded Oct 1 at 1:47

Herman Jaramillo

3,38031 silver badges34 bronze badges

Motivations behind the terminology "factor through projectives"

Awarded Sep 30 at 18:42

Qi Zhu

9,6663 gold badges20 silver badges47 bronze badges

Determine the probability that $A^2 = O$

Awarded Sep 30 at 14:47

Jerry Mahajan

1114 bronze badges

A generalization of the problem: "$\|\Delta u\|_{L^2}$ is an equivalent norm for standard $H^2$ norm in space $H_0^1\cap H^2$

Awarded Sep 30 at 10:37

tks

4402 silver badges13 bronze badges

Construction of algebraic closure

Awarded Sep 30 at 9:50

Rafael

3,99315 silver badges30 bronze badges

list of equivalence form of prime number theorem

Awarded Sep 30 at 8:13

D.R.

11.2k6 gold badges25 silver badges67 bronze badges

Polyomino group structure?

Awarded Sep 30 at 0:31

Ivan Neretin

14k2 gold badges38 silver badges57 bronze badges

Does $({v_n \over u_n}) _{n\in\mathbb{N}} $ converge when $f(x) := \ln(x+1)$ and $f(x) := \ln(\ln(x+e))$?

Awarded Sep 29 at 9:50

Thinh Dinh

9,8906 gold badges22 silver badges59 bronze badges

How to construct a conservative extension of classical logic that intuitionistic logic can be translated into?

Awarded Sep 29 at 8:33

PW_246

1,6541 gold badge5 silver badges19 bronze badges

What lattices beyond the laminated lattices (particularly in $\le 24D$) belong to a slightly expanded category that includes "descendants" of Λ13_mid?

Awarded Sep 29 at 4:33

Kevin M. Lamoreau

1058 bronze badges

Failure of the maximum principle

Awarded Sep 29 at 2:56

Arina Pambukyan

863 bronze badges

Prove that $\sum\limits_{\mathrm{cyc}} \tfrac{1+\sqrt{ab+ac+ad+1}}{1+a} \ge 6$ for positives $abcd = 1$

Awarded Sep 29 at 1:56

River Li

51.4k3 gold badges46 silver badges145 bronze badges

Is multiplication in mixed radix numeral systems complicated?

Awarded Sep 28 at 16:20

David K

111k10 gold badges91 silver badges250 bronze badges

Name this property: product of functions = function of sum

Awarded Sep 28 at 6:53

Emil Jeřábek

2,99618 silver badges17 bronze badges

Linear multivariate recurrences with constant coefficients

Awarded Sep 28 at 1:52

Markus Scheuer

113k7 gold badges107 silver badges253 bronze badges

how many pairs $(A, B)$ are there such that: gcd $(A, B) = A \oplus B$

Awarded Sep 27 at 17:54

beta

213 bronze badges

Two-torus embeddable knots

Awarded Sep 27 at 14:49

Agol

1,0097 silver badges15 bronze badges

Describe the points and the sheaf of functions of some schemes: How to simplify $(\mathbb C[x]/(x^2-x))_{x-1}$?

Awarded Sep 26 at 6:13

Viktor Vaughn

21.1k2 gold badges45 silver badges75 bronze badges

Probability - long-run proportion

Awarded Sep 26 at 1:56

Henry

172k10 gold badges139 silver badges299 bronze badges

Prove or disprove: if $|A|>4$ then $|\mathcal{P}(A)|+|\mathcal{P}(B)| \neq |\mathcal{P}(A\cup B)|$

Awarded Sep 26 at 0:35

Caleb Stanford

47.5k8 gold badges76 silver badges180 bronze badges

Axiomatizable classes

Awarded Sep 25 at 20:47

Alex Kruckman

88.9k5 gold badges105 silver badges172 bronze badges

Is there a rigorous definition of "rule" that can distinguish them from functions?

Awarded Sep 25 at 18:41

Mauro ALLEGRANZA

101k8 gold badges77 silver badges162 bronze badges

How to axiomatically formalise precedence of operations in first-order logic?

Awarded Sep 25 at 14:18

Mauro ALLEGRANZA

101k8 gold badges77 silver badges162 bronze badges

An integral for calculating force between a charged ring and a charged point on 2D plane

Awarded Sep 25 at 9:25

user170231

27.1k3 gold badges49 silver badges96 bronze badges

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