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Uncool
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10
Is the empty set countable?
Mar 12, 2015
7
How to compute a basis for the space of left-invariant 1-forms on a Lie group.
Jun 1, 2022
5
How to show that any continuous map $f:\mathbb{C}^*\to \mathbb{C}^*$ is of the form $f(z)=z^me^{g(z)}?$
Sep 22, 2022
4
If $f:\mathbb{R}\to\mathbb{R}$ is continuous and bijective. Is $f^{-1}:\mathbb{R}\to\mathbb{R}$ continuous?
Sep 4, 2018
3
A function whose absolute value is Lebesgue integrable
May 7, 2015
3
Invertible element can't be nilpotent?
Aug 29, 2022
3
How to show that $f:[0,1]\times{\rm Sp}(n,\mathbb{R})\to {\rm Sp}(n,\mathbb{R})$ is continuous?
Feb 17, 2020
3
The signature of a permutation
May 18, 2023
3
Cannot decide a certain multilinear map is alternating
May 13, 2023
3
Restricting the codomain of a smooth map to submanifold is smooth
Nov 9, 2020