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Mathematics
Suspicious Fred's user avatar
Suspicious Fred's user avatar
Suspicious Fred's user avatar
Suspicious Fred
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question
13
What is the interpretation/intuition of $e^{itA}$ for a self-adjoint unbounded operator?
Jun 21, 2023
question
3
Why are we satisfied to explain the power of Lebesgue integration just by saying it is ''horizontal, rather than vertical''?
Nov 11
question
2
How to prove that $A$ surjective $\iff \ker (A^*) = \{0\}$ and $\operatorname{Im}(A^*)$ is closed?
Jun 18, 2023
question
2
Why is the simple energy functional $\int_\Omega |\nabla u|^2 $ weakly sequentially lower semi-continuous?
Jun 22, 2023
answer
2
Characterization of a probability measure
Apr 7, 2023
answer
2
Integral inequality: $|f(b)| - |f(a)| \le \int^1_0 |f'(x)|dx$
Apr 30, 2023
answer
2
Example of an operator which does not attain its operator norm in the unit ball in $\ell_0\subset\ell^\infty$ (set of zero sequences)
May 14, 2023
question
1
Why do small enough balls have this geodesic property in Riemannian Geometry? [duplicate]
Apr 19, 2023
question
1
What is the meaning of a second order differential operator in differential geometry?
Jan 17, 2024
question
1
How large can $\| x \|_2$ be if $\|x\|_1 = 1, x \geq 0$, and $Fx$ is constant on $n/2$ components?
May 29, 2024