List questions from spectral-theory

Published on 28 Mar 2026 - 21:56

33

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Question about proof of the spectral theorem with the help of Riesz-Markov-Kakutani

Published on 06 Nov 2023 - 10:44

86

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Derivative of Spectral Radius of Matrix $\exp(A(t))$

Published on 26 Mar 2026 - 17:32

166

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Continuous vs holomorphic functional calculus

Published on 06 Nov 2023 - 22:00

68

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Generalization of Borel functional calculus

Published on 07 Nov 2023 - 21:27

58

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Doesn't $A=\sum_{j\in\mathbb N}\lambda_j\phi_j\otimes\phi_j$ imply $A$ is bounded?

Published on 08 Nov 2023 - 12:59

88

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When are the eigenvalues of a Schrödinger operator linear in $n$?

Published on 09 Nov 2023 - 12:13

37

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Type of Matrix with only real eigenvalues

Published on 26 Mar 2026 - 9:35

32

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$\int_0^\lambda z de_z+\lambda p$ is a positive element of a von Neumann algebra $M$ whenever $\lambda >0$

Published on 28 Mar 2026 - 13:40

51

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Essential spectrum of an convolution and function multiplying operator

Published on 14 Nov 2023 - 21:29

74

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Is the point-spectrum of bounded linear integral operators always countable?

Published on 25 Mar 2026 - 6:02

142

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Spectrum of a sum of self-adjoint operators

Published on 30 Mar 2026 - 18:11

216

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Find the $\det(I + A)$ where A is a trigonometric matrix

Published on 20 Nov 2023 - 3:20

269

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Proof of $ran(E(\lambda)) = ker(\lambda-A)^\alpha$

Published on 28 Mar 2026 - 13:22

35

Views

Need help bounding the $L^2$ induced operator norm by the maximum $L^2$ norm of the columns.

Published on 26 Nov 2023 - 15:23

List Question

The Spectrum of the derivative operator in a specific Banach space

Question about proof of the spectral theorem with the help of Riesz-Markov-Kakutani

Derivative of Spectral Radius of Matrix $\exp(A(t))$

Continuous vs holomorphic functional calculus

Generalization of Borel functional calculus

Doesn't $A=\sum_{j\in\mathbb N}\lambda_j\phi_j\otimes\phi_j$ imply $A$ is bounded?

When are the eigenvalues of a Schrödinger operator linear in $n$?

Type of Matrix with only real eigenvalues

$\int_0^\lambda z de_z+\lambda p$ is a positive element of a von Neumann algebra $M$ whenever $\lambda >0$

Essential spectrum of an convolution and function multiplying operator

Is the point-spectrum of bounded linear integral operators always countable?

Spectrum of a sum of self-adjoint operators

Find the $\det(I + A)$ where A is a trigonometric matrix

Proof of $ran(E(\lambda)) = ker(\lambda-A)^\alpha$

Need help bounding the $L^2$ induced operator norm by the maximum $L^2$ norm of the columns.

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