List questions from operator-theory

Published on 14 Apr 2026 - 17:22

559

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Compact integral operator on $L^\infty(\mathbb{R})$

Published on 08 Apr 2026 - 15:33

126

Views

Integral operator with Bessel kernel

Published on 11 Apr 2026 - 13:17

144

Views

Relation between resolutions of the identity for normal operator and its restriction to a reducing closed subspace

Published on 12 Apr 2026 - 4:51

234

Views

Schauder Basis and Approximation property

Published on 14 Apr 2026 - 3:14

112

Views

Norm of the resolvent and inequalities

Published on 26 Mar 2026 - 1:34

96

Views

Invertible and compact operators

Published on 14 Apr 2026 - 10:53

56

Views

Projection for a given embedding of von Neumann algebra.

Published on 27 Mar 2026 - 18:15

101

Views

Jordan Canonical form of the operator $(T^2 - T)|_{\operatorname{Im}(T^4)}$.

Published on 16 Apr 2026 - 20:32

196

Views

Norm of Position Operator in $L^2[0,1]$

Published on 13 Apr 2026 - 12:43

147

Views

Integral operator is not closable

Published on 27 Mar 2026 - 6:50

102

Views

Is $H_0^1\ni u\mapsto(u\cdot\nabla)u$ Fréchet differentiable?

Published on 25 Mar 2026 - 21:31

83

Views

Example of a bijective non-closed linear operator

Published on 13 Apr 2026 - 2:13

70

Views

continuous spectrum of the self-adjoint Schrödinger Operator

Published on 10 Apr 2026 - 18:49

537

Views

Spectrum of momentum operator of quantum physics

Published on 11 Apr 2026 - 7:38

List Question

Is an invariant or reducing subspace necessarily the image of a spectral projection?

Compact integral operator on $L^\infty(\mathbb{R})$

Integral operator with Bessel kernel

Relation between resolutions of the identity for normal operator and its restriction to a reducing closed subspace

Schauder Basis and Approximation property

Norm of the resolvent and inequalities

Invertible and compact operators

Projection for a given embedding of von Neumann algebra.

Jordan Canonical form of the operator $(T^2 - T)|_{\operatorname{Im}(T^4)}$.

Norm of Position Operator in $L^2[0,1]$

Integral operator is not closable

Is $H_0^1\ni u\mapsto(u\cdot\nabla)u$ Fréchet differentiable?

Example of a bijective non-closed linear operator

continuous spectrum of the self-adjoint Schrödinger Operator

Spectrum of momentum operator of quantum physics

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