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Nice Answer

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Why do we sometimes lose solutions when solving equations?

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Robert Israel

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What type of topological space is this?

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AlgTop1854

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Does the limit of $\cos^{2n}(n)$, with $n$ a positive integer, converges as $n\to\infty$?

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Jack D'Aurizio

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Is the union of an arbitrary collection of topological spaces a topological space?

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Mnifldz

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Find a simple proof that π is irrational

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Especially Lime

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Why is only the first (highest) term of the divisor in polynomial long division used to divide?

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Lord_Farin

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Mean value theorem on Riemannian manifold?

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Andrew D. Hwang

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If $A + A^t = 2I$ then $\det(A) \geq 1$

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dezdichado

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What does this sequence of integral converge to?

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Martin R

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How can I prove the Wolfram Alpha result $\int_0^{\infty} \frac{(\sin x)^2}{x^2-\pi ^2} dx=-\frac1{2\pi}$?

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Jack D'Aurizio

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Find a simple proof that π is irrational

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Jam

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Evaluting: $\int\frac{1}{(1+\tan x)^2} dx$

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tulasi

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Evaluate the indefinite integral $\int\frac{dx}{(x^2+1)\sqrt{x^2+1}}$ without trigonometric substitution.

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Travis Willse

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A polynomial has only real roots and all coefficients $\pm 1$. Prove the degree $<4$.

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leshik

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Can octonions be used to rotate 7-dimensional vectors?

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anon

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Rigorous Book on Stochastic Calculus

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saz

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inf of a finite set

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Jim

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What are all of the connected subsets of $\mathbb{Q}$?

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Did

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Proof that angle-preserving map is conformal

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Ayman Hourieh

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Borel $\sigma$-Algebra on Real Numbers and interval elements

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Ittay Weiss

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Cardinal exponentiation without generalized continuum hypothesis

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Noah Schweber

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Particle on a hemisphere - lagrange

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Meclassic

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Functor of points of the affine line with double origin

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Eric Wofsey

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Are Vitali sets dense in [0,1)?

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Arturo Magidin

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Is there math with non-commutative multiplication of real numbers?

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rschwieb

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how to compute $E(X^4)$ when $X$ follow the normal law $N(0,1)$

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klumbard

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The relation between rational forms and Jordan forms.

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Pete L. Clark

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Injective function from $\mathbb{R}^2$ to $\mathbb{R}$?

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Ayman Hourieh

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Lebesgue density strictly between 0 and 1

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George Lowther

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The zeros of an analytic function are isolated

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saulspatz

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Analytic continuation of harmonic series

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Noble Mushtak

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doubt regarding a step proof of Cauchy-Schwarz inequality. Is it valid?

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QuantumSuperfield

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Closure of a point : Zariski Topology.

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Georges Elencwajg

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Exact sequence involving the nabla operator

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Henry T. Horton

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A curious coincidence: $\prod\limits_{k=1}^\infty\left(1+\int_{k}^{k+1}\left(\frac{\sin (\pi x)}{x}\right)^2\mathrm dx\right)\overset{?}{=}\pi/2$

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Oscar Lanzi

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If two definite integrals are equal, does there exist a chain of substitutions and/or partial integrations which will get us from one to the other?

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Did

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Solid tori, meridians, and longitudes

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Lee Mosher

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When do union and intersection commute?

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Robert Israel

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Trying to calculate a limit with a finite product and WolframAlpha disagrees with my logic.

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Greg Martin

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Does ring epimorphism induce reversed fully faithful functors in the module categories?

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Lukas Heger

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Theorems that have proofs from the outside of the original field of math

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KCd

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Conjecture: In Pascal's triangle with $n$ rows, the proportion of numbers less than the centre number approaches $e^{-1/\pi}$ as $n\to\infty$.

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mjqxxxx

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Proving the Cantor Set contains no segment

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WimC

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Extensions of measurable functions

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Zev Chonoles

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The contributions of James Sylvester to linear algebra.

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Wok

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How to integrate $\int \frac{1}{\sin^4x + \cos^4 x} \,dx$?

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Tunk-Fey

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Depiction of convergence in categorical sense

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Trebor

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$n^{th}$ derivative of $\cot x$

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lhf

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the physical significance of the Lie Algebra of SE(3)

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Michael Stachowsky

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Comparison theorem for ODE

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Marcin Malogrosz

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Representing $\frac{3 + \sqrt{5}}{2}$ as a square of a quadratic surd

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SomeStrangeUser

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If $N$ is a normal subgroup of $G$ with $N$ and $G/N$ solvable, prove that $G$ is solvable

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Mikasa

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is $x\sin(1/x)$ bounded? and how can I prove the derivative of it is not bounded?

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zipirovich

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Complex analytic $f$ with $f(z)=u(x)+iv(y)$ must be linear?

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anon

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Is it possible to "sort" a continuous function?

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Robert Israel

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How to factor $a^n - b^n$?

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Skawang

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Convergence in Lp implies convergence in Lp norms finite

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user284331

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Is Fermat's last theorem provable in Peano arithmetic?

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Taroccoesbrocco

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How to explain why the probability of a continuous random variable at a specific value is 0?

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Graham Kemp

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A covariant functor sending every finite-dimensional vector space to its dual?

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Clive Newstead

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