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Approximate inverse of the double factorial

Awarded Oct 14 at 0:20

Claude Leibovici

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How to evaluate : ${\int_0^1\frac{x\ln \left(\frac{x}{2-x}\right)K(\sqrt{x})}{\sqrt{(2-x)^5}}\,\mathrm{d}x}$

Awarded Oct 13 at 15:35

Akerele Olofin

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Calculate $\int_0^1 \frac{x \log(x) \operatorname{arctanh}(x)}{1-a^2 x^2}\textrm{d}x$

Awarded Oct 13 at 8:17

user97357329

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Is there such a mathematical notion as 'antideterminant'?

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my2cts

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Le poisson modulo un

Awarded Oct 13 at 2:37

Lonaldin

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Is the formula $\forall xR(x,y)\rightarrow\exists x\neg R(x,y)$ from "A First Course in Logic" truly unsatisfiable? (erratum)

Awarded Oct 13 at 1:47

陈海斌

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USAMTS $4/2/17$ Duck Goose Goose Problem

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Jason Kim

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Given the graph $y=x^4$, can we construct the $y$-axis using only a straightedge and a compass?

Awarded Oct 12 at 18:09

praton

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Hypervolume of a $N$-dimensional ball in $p$-norm

Awarded Oct 12 at 13:03

Saltimbanco

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Chern classes of tangent bundle over the Grassmannian G(2,4)

Awarded Oct 12 at 12:54

user571305

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Square root gamma function inequality $\sqrt{\Gamma(x)} \ge \Gamma(\sqrt{x})$ for $x > 0$

Awarded Oct 12 at 8:57

Ilovejeff

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A normed space is locally compact iff its closed unit ball is compact.

Awarded Oct 12 at 6:18

Swair

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With ZFC foundations, if all math objects are sets, where do these sets "live"?

Awarded Oct 11 at 23:11

mareli

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Five squares are next to each other. What is area of the shaded triangle?

Awarded Oct 11 at 19:02

User

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Combinatorial or probabilistic proof of $\sum_{k=0}^n C_{2k}C_{2n-2k}=2^{2n}C_n$

Awarded Oct 11 at 17:36

Sangchul Lee

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Elementary Row/Column Operations and Change of Basis

Awarded Oct 11 at 3:18

ItsNotObvious

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Professor insists $-0$ does not exist, am I crazy?

Awarded Oct 10 at 21:58

Obo the Hobo

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Confused about Markov property

Awarded Oct 10 at 18:52

soup

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If you have $2n$ people how many different ways can you pair them up?

Awarded Oct 10 at 18:01

OskarSzarowicz

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$\int_0^\infty \frac{\log(1+x^2)}{x^2} dx $ using contour integration

Awarded Oct 10 at 17:52

CunningTF

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Implementing trig functions for dual numbers

Awarded Oct 10 at 12:53

Yaroslav Bulatov

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If $f^N$ is contraction function, show that $f$ has precisely one fixed point. [duplicate]

Awarded Oct 10 at 7:30

JSCB

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Proving a linear transformation is unique

Awarded Oct 9 at 19:20

Peter_Pan

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Irreducible closed subsets of a scheme corresponds to points

Awarded Oct 9 at 14:47

mez

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Alternative introduction to tensor products of vector spaces

Awarded Oct 9 at 14:22

Martin Brandenburg

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Is it true that the sequence $\{n \sin(n^n/2)\}$ is unbounded but doesn't tend to infinity?

Awarded Oct 9 at 13:38

Lei Zhao

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"The number of ways to choose 3 letters from FORTY-ONE is 41." Is there an infinite number of statements like this?

Awarded Oct 9 at 11:20

Dan

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A functional analogue to a finite geometric series

Awarded Oct 9 at 5:48

TheSimpliFire♦

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Converting Jordan Normal Form into Real Jordan Form

Awarded Oct 8 at 14:17

Complicated

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Embeddings between Hölder spaces $ C^{0,\beta} \hookrightarrow C^{0, \alpha} .$

Awarded Oct 8 at 10:10

passenger

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Möbius strip as a non-trivial principal bundle

Awarded Oct 8 at 9:20

octopus

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Taylor Series of a finite degree polynomial

Awarded Oct 8 at 5:28

MagicMicro

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defining smooth functions on smooth manifolds

Awarded Oct 7 at 16:50

symplectomorphic

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Why do we consider there to be gaps between rational numbers, and not between real numbers?

Awarded Oct 7 at 13:41

some kid trying her best

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the affine scheme of an integral ring is integral

Awarded Oct 7 at 13:26

Arsenaler

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$\|f\|_p\to \|f\|_\infty$ under general assumptions

Awarded Oct 7 at 9:18

operatorerror

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Examples of integration by parts that work both ways

Awarded Oct 7 at 4:10

TheSimpliFire♦

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How is homology "weaker than" homotopy?

Awarded Oct 6 at 17:10

Cauchy01

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How is the “ Axiom of choice is trivial in intuitionistic logic”?

Awarded Oct 6 at 16:23

Lave Cave

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Evaluation of $\int_0^{\frac{\pi}{2}}\frac{f(x)}{2+\sin(x)}dx$

Awarded Oct 6 at 14:07

OnTheWay

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Determine the maximum number of inflection points on $y=(1+x^{u_1})(1+x^{u_2})\dots(1+x^{u_n})$ where $u_i\in\mathbb{Z^+}$.

Awarded Oct 6 at 10:55

Dan

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$x^4 - y^4 = 2z^2$ has no solution

Awarded Oct 6 at 6:51

noddy

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How do French mathematicians write ordered pairs, since they already use the comma as a decimal separator?

Awarded Oct 6 at 3:28

Pineapple Fish

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Challenging integral $I=\int_0^{\pi/2}x^2\frac{\ln(\sin x)}{\cos x}dx$

Awarded Oct 5 at 20:19

user178256

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Sobolev space and equivalence of norms

Awarded Oct 5 at 17:24

Simon

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Why is the powerset axiom more acceptable than the axiom of choice?

Awarded Oct 5 at 14:47

Conifold

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Generalized Fermat Point

Awarded Oct 5 at 13:46

Aaron Goldsmith

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Proving that the outer measure of a closed interval $[a,b]$ is $b-a$

Awarded Oct 5 at 5:34

Subhasish Mukherjee

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How to succinctly distinguish the categories $\mathbf{Mon}$ and $\mathbf{Rng}$?

Awarded Oct 5 at 1:47

Martin Brandenburg

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Is ℝ uniquely determined by the “point removal splits it into two copies of itself” property?

Awarded Oct 5 at 1:31

Jaborandi Kakapo

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What's the easiest way to help a high schooler understand how to avoid the trap of extraneous and missing solutions?

Awarded Oct 4 at 21:51

CuriousMind

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Functional Equations with Taylor Series

Awarded Oct 4 at 17:54

Franklin Pezzuti Dyer

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Every subspace of a separable metric space is separable. [duplicate]

Awarded Oct 4 at 13:18

James Snell

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Prove two angles add up to 90 degrees

Awarded Oct 3 at 23:20

CuriousMind

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Name for percentage as a decimal between 0 and 1 inclusive

Awarded Oct 3 at 23:06

OMGtechy

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Understanding Kolmogorov Backward/Forward equation correctly

Awarded Oct 3 at 21:27

particle-not good at english

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Evaluation of $\int_{0}^{\infty}\frac{\operatorname{sech}\left(\frac{x}{2}\right)}{(\pi^2+x^2)^2}dx$

Awarded Oct 3 at 15:37

OnTheWay

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Is Ramanujan's construction for squaring the circle based on his approximation $\pi\approx\sqrt[4]{\frac{2143}{22}}$ still the "best"?

Awarded Oct 3 at 13:27

lesath82

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How to denote domain and range

Awarded Oct 3 at 12:43

brianmearns

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Which mapping tori are Seifert manifolds?

Awarded Oct 3 at 12:43

fuglede

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