List questions from spectral-theory

Published on 16 May 2016 - 19:43

666

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Element with maximum magnitude in $A \leq \max(\sigma_{i})$, where $\sigma_{i}$ is singular values of A

Published on 30 Mar 2026 - 5:00

210

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range of weighted shift operator

Published on 17 May 2016 - 11:53

2k

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Eigenvalues of the circle over the Laplacian operator

Published on 31 Mar 2026 - 19:18

92

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Spectrum of the circle - Clarification of certain points

Published on 19 May 2016 - 1:38

82

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Periodic function with the capacity of being $g'' = \lambda g$

Published on 02 Apr 2026 - 3:55

103

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Periodic function - Differential equation on an existing question

Published on 02 Apr 2026 - 5:31

452

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Spectrum of linear operator, essential spectral radius

Published on 20 May 2016 - 16:14

69

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The particularity of $k$ being an integer in the solution of a DE

Published on 31 Mar 2026 - 19:15

1.7k

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Laplace-Beltrami operator on a circle - Explanation

Published on 31 Mar 2026 - 19:17

558

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Coefficients of the eigenfunction

Published on 27 Mar 2026 - 14:55

174

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How to prove $r(T_1 + T_2) \leq r(T_1) + r(T_2)$ when $T_1T_2 = T_2T_1$ for bounded linear operators?

Published on 22 May 2016 - 5:32

346

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Wave kernel for the circle $\mathbb{S}^1$ - Poisson Summation Formula

Published on 31 Mar 2026 - 19:12

133

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Expansion theorem or Poisson Summation Formula? - Basis of eigenfunctions gives rise to a Fourier series

Published on 27 Mar 2026 - 14:56

121

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Compact resolvent proof

Published on 24 May 2016 - 10:25

List Question

proof of an equality norm

Element with maximum magnitude in $A \leq \max(\sigma_{i})$, where $\sigma_{i}$ is singular values of A

range of weighted shift operator

Eigenvalues of the circle over the Laplacian operator

Spectrum of the circle - Clarification of certain points

Periodic function with the capacity of being $g'' = \lambda g$

Periodic function - Differential equation on an existing question

Spectrum of linear operator, essential spectral radius

The particularity of $k$ being an integer in the solution of a DE

Laplace-Beltrami operator on a circle - Explanation

Coefficients of the eigenfunction

How to prove $r(T_1 + T_2) \leq r(T_1) + r(T_2)$ when $T_1T_2 = T_2T_1$ for bounded linear operators?

Wave kernel for the circle $\mathbb{S}^1$ - Poisson Summation Formula

Expansion theorem or Poisson Summation Formula? - Basis of eigenfunctions gives rise to a Fourier series

Compact resolvent proof

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