Mathematics
Zhang Yuhan's user avatar
Zhang Yuhan's user avatar
Zhang Yuhan's user avatar
Zhang Yuhan
  • Member for 4 years, 8 months
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Undergraduate.

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Top posts
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question
6
Existence of Abelian group extension relative to group homomorphism
Nov 12, 2021
question
5
What can we get from the square integrability of the derivative?
Oct 23, 2020
answer
5
Infinite Intersection of Nested Connected Sets that are Disconnected
Oct 23, 2020
question
4
Loops in commutative diagrams
Oct 29, 2020
question
4
Canonical inverse for Laplacian operator in $C^\infty(\mathbb R^n)$
Sep 17, 2022
question
3
Smooth Jordan-Schönflies Curve Theorem
Oct 6, 2020
question
3
Is natural projection a natural transformation?
Oct 30, 2020
question
3
Fourier transform of product: proof without invoking Fourier inversion theorem
Dec 2, 2022
answer
3
Almost Vandermonde determinant
Oct 11, 2020
answer
3
How to show that ${\omega \in \Omega : X(\omega) \neq Y(\omega)}$ is a measurable set, $X,Y$ being $\overline{\mathbb{R}}$-valued.
Oct 28, 2020
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15
Nontrivial signed measure on Lebesgue measurable sets being trivial on Borel sets
9
Prove J.L. Lions’s Lemma without using Fourier transform
7
Existence of abelian group extension relative to group homomorphism
5
Homology of singular chain complex modulo subdivision
5
Naturality of Lie bracket — alternate proof