List questions from normed-spaces

Published on 13 Apr 2026 - 21:20

944

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Triangle Equality in a normed linear space

Published on 14 Apr 2026 - 8:57

264

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Special matrix: formed by sides of tetrahedron

Published on 16 Apr 2026 - 8:23

260

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Are all Semi-simple commutative Banach algebras finite-dimensional?

Published on 16 Apr 2026 - 3:32

111

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Norm of an Operator on $L^2(\mu)$

Published on 10 Apr 2026 - 18:44

43

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Correspondence from elements of $L^2(\mu\times\mu)$ to operators on $L^2(\mu)$

Published on 15 Apr 2026 - 11:40

75

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one question about $\|V^HAV\|=\|A\|$

Published on 09 Apr 2026 - 2:00

48

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Norm of continuous variable in $R^n$

Published on 12 Apr 2026 - 9:36

255

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Counterexample showing that weakly* bounded sets might not be norm bounded in a normed spaces.

Published on 15 Apr 2026 - 0:55

3.9k

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Another definition of a Holder norm

Published on 11 Apr 2026 - 5:25

50

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symplectic maps and continuity

Published on 14 Apr 2026 - 23:30

93

Views

How to show $z\perp Y$, where $Y$ is a proper closed subspace of a Hilbert space?

Published on 13 Apr 2026 - 7:52

1.1k

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What is the definition of the nuclear norm (aka trace norm, Ky-Fan n-norm) of a tensor?

Published on 25 Mar 2026 - 4:43

175

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How to prove the solution of these inequalities is empty?

Published on 15 Apr 2026 - 14:36

206

Views

Counterexample showing that weakly* compact sets might not be norm bounded in a normed spaces.

Published on 13 Apr 2026 - 16:22

List Question

If $V\subset L^\infty[0,1]$ with $\|f\|_\infty \leq c\|f\|_2$, then $V$ is finite dimensional

Triangle Equality in a normed linear space

Special matrix: formed by sides of tetrahedron

Are all Semi-simple commutative Banach algebras finite-dimensional?

Norm of an Operator on $L^2(\mu)$

Correspondence from elements of $L^2(\mu\times\mu)$ to operators on $L^2(\mu)$

one question about $\|V^HAV\|=\|A\|$

Norm of continuous variable in $R^n$

Counterexample showing that weakly* bounded sets might not be norm bounded in a normed spaces.

Another definition of a Holder norm

symplectic maps and continuity

How to show $z\perp Y$, where $Y$ is a proper closed subspace of a Hilbert space?

What is the definition of the nuclear norm (aka trace norm, Ky-Fan n-norm) of a tensor?

How to prove the solution of these inequalities is empty?

Counterexample showing that weakly* compact sets might not be norm bounded in a normed spaces.

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