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Python
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NEWBEDEV
Python
Javascript
Linux
Cheat sheet
New posts in Examples Counterexamples
Examples of almost compact spaces.
May 10, 2021
handshaking lemma and Erdos-Gallai theorem
May 10, 2021
Counterexample regarding basic properties of limits
May 09, 2021
Homeomorphic metric spaces where the identity map is not a homeomorphism
May 09, 2021
A category which direct limits but no general colimits
May 09, 2021
Functor that does not preserve monic and epic
May 09, 2021
$n$ is prime iff $\binom{n^2}{n} \equiv n \pmod{n^4}$?
May 09, 2021
Given that $x_0$ is a real root of $x^3+px + q = 0$, how can I show that $p^2 \geq 4x_0q$?
May 09, 2021
How big can $U\subset\mathbb{C}$ be if there exists a non-constant holomorphic $f\colon U\to\mathbb{C}$ with $2f(2z)=f(z)+f(z+1)?$
May 09, 2021
Functions $f: \mathbb{Z}^{+}\to \mathbb{R}$ satisfying $x f(y) + y f(x) = (x+y) f(x^2+y^2)$
May 08, 2021
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