Question

Fourier series of iterated sin / Diagonalization of an infinite matrix of Bessel functions

score 182 · Answer 1 · 2026-03-25 19:09:55

182

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Fourier series of iterated sin / Diagonalization of an infinite matrix of Bessel functions

Published on 25 Mar 2026 - 19:09

score 85 · Answer 2 · 2026-03-26 01:04:32

85

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$\text{ran}\,N$ is closed if and only if $0$ is no limit point of $\sigma(N)$, for a normal bounded operator $N$ on a hilbert space $H$

Published on 26 Mar 2026 - 1:04

score 231 · Answer 3 · 2026-03-31 19:45:22

231

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Eigenvalues of compact operator from the eigenvalues of the sequence of the approximating finite rank operators

Published on 31 Mar 2026 - 19:45

score 433 · Answer 4 · 2021-11-07 13:37:42

433

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Why bounded linear operators on Hilbert space are defined on the whole space

Published on 07 Nov 2021 - 13:37

score 59 · Answer 5 · 2021-11-07 19:30:40

59

Views

Deducing the almost-commutativity of the spectral projections of almost-commuting operators

Published on 07 Nov 2021 - 19:30

score 136 · Answer 6 · 2026-04-09 01:43:43

136

Views

A question related to the eigenvalues of a shift operator

Published on 09 Apr 2026 - 1:43

score 49 · Answer 7 · 2021-11-09 10:14:32

49

Views

right and left eigenvectors of some specific diagonalizable non normal matrix

Published on 09 Nov 2021 - 10:14

score 171 · Answer 8 · 2021-11-09 16:17:20

171

Views

Spectrum of $Tf(x) := \frac{1}{x}\int_{0}^{x}f(t)dt $

Published on 09 Nov 2021 - 16:17

score 419 · Answer 9 · 2026-03-31 19:41:39

419

Views

Spectral theorem for compact operators

Published on 31 Mar 2026 - 19:41

score 147 · Answer 10 · 2021-11-21 23:43:09

147

Views

What's the connection between $\exp_\text{Lie}$ and $\exp_\text{Spectral}$?

Published on 21 Nov 2021 - 23:43

score 333 · Answer 11 · 2021-11-23 19:02:58

333

Views

Gelfand formula for the spectral radious.

Published on 23 Nov 2021 - 19:02

score 115 · Answer 12 · 2021-11-24 23:30:01

115

Views

Property of spectrum of an operator: $\sigma(T)=\sigma_{app}(T)\cup\sigma_{comp}(T)$

Published on 24 Nov 2021 - 23:30

score 342 · Answer 13 · 2021-11-25 00:33:07

342

Views

Spectral Theorem applied to $\frac{d^2}{dx^2}$

Published on 25 Nov 2021 - 0:33

score 149 · Answer 14 · 2026-03-26 01:07:54

149

Views

Prove that if $A$ is a normal operator on an complex separable hilbert space $H$ and $A^{3} = A^{4}$ then $A$ is self adjoint

Published on 26 Mar 2026 - 1:07

score 297 · Answer 15 · 2021-11-30 21:20:25

297

Views

C*-algebras and unitary elements.

Published on 30 Nov 2021 - 21:20

List Question

Fourier series of iterated sin / Diagonalization of an infinite matrix of Bessel functions

$\text{ran}\,N$ is closed if and only if $0$ is no limit point of $\sigma(N)$, for a normal bounded operator $N$ on a hilbert space $H$

Eigenvalues of compact operator from the eigenvalues of the sequence of the approximating finite rank operators

Why bounded linear operators on Hilbert space are defined on the whole space

Deducing the almost-commutativity of the spectral projections of almost-commuting operators

A question related to the eigenvalues of a shift operator

right and left eigenvectors of some specific diagonalizable non normal matrix

Spectrum of $Tf(x) := \frac{1}{x}\int_{0}^{x}f(t)dt $

Spectral theorem for compact operators

What's the connection between $\exp_\text{Lie}$ and $\exp_\text{Spectral}$?

Gelfand formula for the spectral radious.

Property of spectrum of an operator: $\sigma(T)=\sigma_{app}(T)\cup\sigma_{comp}(T)$

Spectral Theorem applied to $\frac{d^2}{dx^2}$

Prove that if $A$ is a normal operator on an complex separable hilbert space $H$ and $A^{3} = A^{4}$ then $A$ is self adjoint

C*-algebras and unitary elements.

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