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3h ago
How to show that a set of discontinuous points of an increasing function is at most countable
— AKM
1065
1d ago
How to show in a clean way that $z^4 + (x^2 + y^2 - 1)(2x^2 + 3y^2-1) = 0$ is a torus?
— Damien L
3,50126
1d ago
Let $f :\mathbb{R}→ \mathbb{R}$ be a function such that $f^2$ and $f^3$ are differentiable. Is $f$ differentiable?
— ROBINSON
64714
2d ago
Closed form for $\int_0^\infty\frac{\log\left(1+\frac{\pi^2}{4\,x}\right)}{e^{\sqrt{x}}-1}\mathrm dx$
— Oksana Gimmel
865211
2d ago
Prove that there are infinitely many natural numbers $n$, such that $n(n+1)$ can be expressed as sum of two positive squares in two distinct ways.
— Inceptio
4,645520
2d ago
Does $X\times S^1\cong Y\times S^1$ imply that $X\times\mathbb R\cong Y\times\mathbb R$?
— Grumpy Parsnip
9,57911347
2d ago
Which real functions have their higher derivatives tending pointwise to zero?
— John Bentin
1,5571512
2d ago
Simplifying $\sqrt{\underbrace{11\dots1}_{2n\ 1's}-\underbrace{22\dots2}_{n\ 2's}}$
— Jeff
1795
may 19 at 2:26
Edge percolation on $\mathbb{Z}^2$: probability that two neighbouring vertices are connected?
— Eckhard
2,362314
may 18 at 23:26
An integral involving Fresnel integrals $\int_0^\infty \left(\left(2\ S(x)-1\right)^2+\left(2\ C(x)-1\right)^2\right)^2 x\ \mathrm dx,$
— Marty Colos
1346
