List questions from operator-theory

Published on 28 Mar 2026 - 15:26

230

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Show that hermitian element $h=\sum p_n/3^n$ generates $ C_0(\Omega)$

Published on 27 Mar 2026 - 6:42

382

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Norm of an operator and eigenvalues

Published on 04 Apr 2026 - 12:42

67

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$\phi(A^+) \subset B^+$ when $\phi: A\to B$ is an isometric linear map

Published on 27 Mar 2026 - 6:42

98

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Extending $$-isomorphisms between $$-algebras to cross products.

Published on 08 Apr 2026 - 12:45

64

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Dynamics: Schwinger-Dyson-Expansion

Published on 01 Apr 2026 - 19:05

99

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Can a Local Fractional Differential Operator exist?

Published on 08 Apr 2026 - 0:48

1.1k

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Erwin Kreyszig's Introductory Functional Analysis With Applications, Section 2.7, Problem 6

Published on 08 Apr 2026 - 16:25

81

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the norm of a linear operator

Published on 08 Apr 2026 - 6:41

290

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If $I$ is a closed ideal in a C*-algebra $A$ and $J$ is a closed ideal in $I$ then $J$ is an ideal of $A$

Published on 27 Mar 2026 - 8:29

193

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Resolvent operator

Published on 25 Mar 2026 - 8:05

511

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The ideal generated by a non-compact operator

Published on 08 Apr 2026 - 13:44

57

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The resolvent of a differentation operator on $C[a,b]$

Published on 25 Mar 2026 - 11:32

298

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$s \in L^{1}(H)$ $\iff$ $s=\sum_{i=0}^\infty x_{i} \otimes y_{i} $

Published on 26 Mar 2026 - 19:19

393

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If $H$ is a one-dimensional Hilbert space then the zero representation of a C*-algebra on $H$ is irreducible.

Published on 26 Mar 2026 - 17:33

List Question

Spectra of periodic Schrödinger equations

Show that hermitian element $h=\sum p_n/3^n$ generates $ C_0(\Omega)$

Norm of an operator and eigenvalues

$\phi(A^+) \subset B^+$ when $\phi: A\to B$ is an isometric linear map

Extending $$-isomorphisms between $$-algebras to cross products.

Dynamics: Schwinger-Dyson-Expansion

Can a Local Fractional Differential Operator exist?

Erwin Kreyszig's Introductory Functional Analysis With Applications, Section 2.7, Problem 6

the norm of a linear operator

If $I$ is a closed ideal in a C*-algebra $A$ and $J$ is a closed ideal in $I$ then $J$ is an ideal of $A$

Resolvent operator

The ideal generated by a non-compact operator

The resolvent of a differentation operator on $C[a,b]$

$s \in L^{1}(H)$ $\iff$ $s=\sum_{i=0}^\infty x_{i} \otimes y_{i} $

If $H$ is a one-dimensional Hilbert space then the zero representation of a C*-algebra on $H$ is irreducible.

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