List questions from normed-spaces

Published on 12 Apr 2026 - 18:43

49

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Inner product deduced from norm

Published on 12 Apr 2026 - 14:16

52

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prove an equivalence norm

Published on 01 Apr 2026 - 1:11

79

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prove equivalence norm

Published on 12 Apr 2026 - 4:37

82

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Norm of a linear map: Alternative definition?

Published on 08 Apr 2026 - 14:11

120

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Let $Y$ be a proper subspace of $(X, \| \cdot \|)$. Is $\text{dist}(x,Y) > 0$ for $x \in X \setminus Y$?

Published on 03 Apr 2026 - 10:58

23

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If $D$ is $\|.\|-$separable subset of $X$. Then $D$ is Suslin space?

Published on 03 Apr 2026 - 20:16

141

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sequence in $l_{1}$ and $l_{\infty}$

Published on 06 Jun 2020 - 15:11

131

Views

Find all vector spaces $X$ such that every two norms are equal

Published on 06 Jun 2020 - 15:59

137

Views

Estimating the norm of inverse matrix

Published on 12 Apr 2026 - 9:58

76

Views

Dual atomic norm with respect to trigonometric polynomials basis set

Published on 12 Apr 2026 - 7:50

352

Views

Proof that $\|Ax\|_2=\|x\|_2$ if $A$ is an unitary matrix and $ A \in C^{m \times m}$

Published on 08 Jun 2020 - 11:08

142

Views

Show that each local max/min point is a critical point

Published on 08 Jun 2020 - 11:17

45

Views

Are there two norms in any space that neither of them is subordinate to the other?

Published on 25 Mar 2026 - 4:42

370

Views

Spectrum and resolvent set of operator $ (Tx)(t) = (1+t^2) x(t) $ on $C[0,1]$

Published on 30 Mar 2026 - 3:38

List Question

product of matrices, and its norm

Inner product deduced from norm

prove an equivalence norm

prove equivalence norm

Norm of a linear map: Alternative definition?

Let $Y$ be a proper subspace of $(X, \| \cdot \|)$. Is $\text{dist}(x,Y) > 0$ for $x \in X \setminus Y$?

If $D$ is $\|.\|-$separable subset of $X$. Then $D$ is Suslin space?

sequence in $l_{1}$ and $l_{\infty}$

Find all vector spaces $X$ such that every two norms are equal

Estimating the norm of inverse matrix

Dual atomic norm with respect to trigonometric polynomials basis set

Proof that $\|Ax\|_2=\|x\|_2$ if $A$ is an unitary matrix and $ A \in C^{m \times m}$

Show that each local max/min point is a critical point

Are there two norms in any space that neither of them is subordinate to the other?

Spectrum and resolvent set of operator $ (Tx)(t) = (1+t^2) x(t) $ on $C[0,1]$

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