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Organizer

First retag.

Awarded 8503 times.

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Awarded yesterday

Tin Tapak Dum Dum

10310 bronze badges

Find $\angle C$ given the relation $a^4 + b^4 + c^4 = 2a^2c^2+2b^2c^2$ [closed]

Awarded Nov 25 at 12:39

thedeepdeepsky

Formula for $\sin(\pi/n)$ with $n$ a positive integer [closed]

Awarded Nov 19 at 12:34

coffeemath

7,6863 gold badges15 silver badges31 bronze badges

Possible Error in Dedekind Construction of Stillwell's Book

Awarded Nov 9 at 13:11

SO Stinks

1036 bronze badges

Running supremum and complete $\sigma$-algebra

Awarded Nov 7 at 18:53

Steve Norkus

4232 silver badges12 bronze badges

Minimality of an overgroup fusing $x$ and $y$

Awarded Nov 6 at 16:42

Sachin Valera

8856 silver badges14 bronze badges

partial derivatives of an unknown function [closed]

Awarded Nov 6 at 7:05

scripher

4071 silver badge10 bronze badges

(post deleted or otherwise unavailable)

Awarded Nov 5 at 21:30

Andre Lin

4911 silver badge13 bronze badges

compute $\int\limits_{0}^{1} \frac{\sinh^{-1} \left( \sqrt{\frac{1}{2+x}} \right)}{\sqrt{3 - 2x - x^2}} \, \textrm dx$

Awarded Nov 3 at 18:38

Milo Khong

1,3133 silver badges12 bronze badges

Factorization and conditional independence

Awarded Nov 3 at 6:13

Tegh

436 bronze badges

Can regularization (Abel/Borel) of a divergent derivative series tell us about $f'(x)$?

Awarded Nov 3 at 4:12

Nolord

2,2285 silver badges26 bronze badges

Prove $\triangle BFQ \sim \triangle CEQ$ in the circumcircle of $\triangle ABC$

Awarded Nov 2 at 10:07

John O'neil

1,06312 bronze badges

In a trapezium $ABCD$, by trigonometric relations find the value of $\angle CBA$.

Awarded Oct 27 at 2:23

Poeny

1177 bronze badges

$\dfrac{\mathrm{d}^n}{\mathrm{d}x^n}\dfrac{e^{ax}}{\ln(cx)}$ and summation with Stirling number of the first kind

Awarded Oct 25 at 0:47

DroneBetter

6744 silver badges18 bronze badges

(post deleted or otherwise unavailable)

Awarded Oct 23 at 19:46

user683

477 bronze badges

(post deleted or otherwise unavailable)

Awarded Oct 21 at 5:57

JC Q

1,8492 silver badges17 bronze badges

Defining an integral operator

Awarded Oct 17 at 17:55

Suraj Gavhale

2006 bronze badges

Why the area function of $\frac{1}{x^2}$ isn’t the same as its antiderivative?

Awarded Oct 16 at 0:35

Amelia Tearheart

1577 bronze badges

How do I write a Piecewise function in a single equation?

Awarded Oct 14 at 13:46

WoolierThanThou

13.8k10 silver badges24 bronze badges

Product of varieties is categorical product (Hartshorne)

Awarded Oct 2 at 20:48

Fnark Man

6593 silver badges17 bronze badges

(post deleted or otherwise unavailable)

Awarded Sep 28 at 16:20

Gamer Rossi

8901 silver badge12 bronze badges

Why am I winning always? A coincidence perhaps?

Awarded Sep 27 at 14:06

Akkert

1597 bronze badges

Deformation Retract of Complement of Two Linked Circles in $\mathbf R^3$

Awarded Sep 27 at 6:23

user1693987

6951 silver badge12 bronze badges

(post deleted or otherwise unavailable)

Awarded Sep 25 at 15:48

somerandomguy

314 bronze badges

Polyomino group structure?

Awarded Sep 24 at 4:43

mezzoctane

1,5736 silver badges17 bronze badges

(post deleted or otherwise unavailable)

Awarded Sep 23 at 19:53

Bilal Aytekin

135 bronze badges

Lie group, differential of multiplication map

Awarded Sep 23 at 8:08

Quaeram

396 bronze badges

Finding a closed form for $\sum_{r=0}^{n}{\frac{1}{4^r}\binom{2r}{r}}$

Awarded Sep 20 at 16:17

Maverick

11.2k3 gold badges39 silver badges81 bronze badges

Matrix columns and independence

Awarded Sep 19 at 10:18

PowPaw

1,8289 silver badges17 bronze badges

(post deleted or otherwise unavailable)

Awarded Sep 18 at 12:53

연하준

5592 silver badges12 bronze badges

Is $(2n)!$ the same as $2(n!)$?

Awarded Sep 17 at 8:31

user1540346

56114 bronze badges

What is a set that can have infinite elements, the order matters and can have repeated elements?

Awarded Sep 9 at 21:43

Linear Christmas

2,2611 gold badge15 silver badges26 bronze badges

Prove that the Closure of An Algebra is An Algebra

Awarded Aug 28 at 18:44

Dermot Craddock

5,37914 silver badges34 bronze badges

transcendence of logarithms and exponentials in differential fields

Awarded Aug 28 at 8:47

tth2507

5161 gold badge3 silver badges15 bronze badges

(post deleted or otherwise unavailable)

Awarded Aug 24 at 14:53

Noor

1,0581 silver badge13 bronze badges

Rotated rectangle with dimensions $c \times d$ inscribed in a rectangle with dimensions $a \times b$. How to express $d$ knowing $a,b,c$?

Awarded Aug 23 at 16:01

ZolVas

1356 bronze badges

Can you always extend a smooth portion of the boundary to enclose a subdomain?

Awarded Aug 22 at 19:11

Christophe Boilley

12.7k1 gold badge9 silver badges30 bronze badges

If $G$ is a group of order $29 \cdot 30$, then $G$ has a normal Sylow-$29$ subgroup

Awarded Aug 22 at 15:34

algebra learner

59114 bronze badges

How to derive the expected value of even powers of a standard normal random variable?

Awarded Aug 16 at 22:03

Feng Cheng

941 gold badge1 silver badge8 bronze badges

Prove $H$ is isomorphic to $D_6$

Awarded Aug 14 at 6:41

user1673562

19411 bronze badges

Find all polynomials such that $f(x)$ divides $f(2x^3+x)$

Awarded Aug 11 at 13:57

Kevin Chen

1662 silver badges13 bronze badges

Evaluating $\int_0^1 \int_0^1 \frac{\ln(1 - xy)}{1 - xy^2} \, dx \, dy $

Awarded Aug 10 at 14:39

S.G

3081 silver badge10 bronze badges

$\min$ value of $f(x)=a\sec x+b\csc x\;,$ Where $a,b>0$ and $\displaystyle x\in \left(0,\frac{\pi}{2}\right)$

Awarded Aug 9 at 5:54

Shreyansh Jaiswal

3502 silver badges16 bronze badges

What is a left-invariant vector field on a Lie Group G? [closed]

Awarded Aug 8 at 8:13

Deva Iyer

7311 bronze badges

Let $(a^2+ 1) (b^2 + 1)(c^2+ 1) = 9$ where $a, b, c \in\mathbb R$, then find the range of $(ab+bc+ca)$.

Awarded Aug 7 at 17:09

Aadya Chaudhary

7992 silver badges18 bronze badges

finding an optimal set of relative frequencies that generate an optimal prefix-free code (Huffman)

Awarded Aug 2 at 20:16

mnz

4232 silver badges13 bronze badges

Is equality the same as identity?

Awarded Aug 2 at 1:57

Him

4553 silver badges19 bronze badges

Understanding the weak* topology on the space of distributions

Awarded Jul 30 at 12:57

travelingbones

3881 silver badge13 bronze badges

Algebraic independence of even polynomials

Awarded Jul 27 at 12:12

Ralph Sabbagh

1276 bronze badges

Find all solutions of the ODE $x^\prime = \sin(x)t$ with $x(0)=\frac{\pi}{2}$

Awarded Jul 22 at 10:45

Wang

4264 silver badges11 bronze badges

(post deleted or otherwise unavailable)

Awarded Jul 16 at 23:54

Pavan C.

1,7437 silver badges9 bronze badges

Clarification on the definition of $C^r$ maximal atlas via unions of equivalent atlases. ("Basic Manifold Theory" by Yukio Matsumoto.)

Awarded Jul 15 at 18:49

Daniel Smania

8,9771 gold badge10 silver badges33 bronze badges

Expected Value of Xn-1 in U~(0,1) distribution

Awarded Jul 12 at 9:10

userא0

8891 gold badge4 silver badges15 bronze badges

Discrete SIR model

Awarded Jul 10 at 13:08

artemetra

6743 silver badges18 bronze badges

Finding equation for Hyperbola, given 3 points.

Awarded Jul 10 at 4:50

Yiyj1

1,1132 silver badges19 bronze badges

What is the name for this lemma/theorem? Any reference?

Awarded Jul 7 at 15:04

Gougu

33 bronze badges

If $f$ is continuous, nonnegative on $[a, b]$, show that $\int_{a}^{b} f(x) dx = 0$ iff $f(x) = 0$

Awarded Jul 6 at 1:02

Anerdw

1056 bronze badges

Direct proof of [second-countable $\wedge$ sequentially compact $\to$ compact]

Awarded Jul 5 at 19:06

Frank

3,52112 silver badges20 bronze badges

How uniform marginals and deterministic conditionals maximize mutual information

Awarded Jul 2 at 15:05

Dang Dang

2882 gold badges5 silver badges25 bronze badges

Suppose that $P$ and $Q \in \mathbb{Z}[X]$ are such that $\gcd(P,Q)=1$, show that $\gcd(P(n),Q(n))$ is periodic.

Awarded Jul 1 at 22:26

fox_lemma

336 bronze badges

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