Question

Spectrum of Fourier Transform

score 60 · Answer 1 · 2023-05-05 11:43:00

60

Views

Spectrum of Fourier Transform

Published on 05 May 2023 - 11:43

score 80 · Answer 2 · 2023-05-07 20:55:07

80

Views

"Counterexample" to Weyl's criterion on spectrum

Published on 07 May 2023 - 20:55

score 133 · Answer 3 · 2023-05-07 22:41:33

133

Views

Check if operators are unitary equivalent

Published on 07 May 2023 - 22:41

score 60 · Answer 4 · 2023-05-08 10:26:20

60

Views

How to relate SVD and Eigendecomposition of squared complex non-symmetrical matrix

Published on 08 May 2023 - 10:26

score 37 · Answer 5 · 2026-03-29 11:44:20

37

Views

Does a symmetric matrix with only three types of values have always three types of eigenvalues?

Published on 29 Mar 2026 - 11:44

score 172 · Answer 6 · 2023-05-11 12:22:54

172

Views

Spectrum of a Multiplication Operator via Fourier Transform

Published on 11 May 2023 - 12:22

score 50 · Answer 7 · 2026-02-23 15:30:45

50

Views

Showing that $||(A-\lambda I)||^{-1}=\frac{1}{d(\lambda,\sigma(A))}$ for $A\in B(H)$ self-adjoint, $\lambda\in\mathbb{C}\setminus\sigma(A)$

Published on 23 Feb 2026 - 15:30

score 68 · Answer 8 · 2026-03-26 09:34:16

68

Views

Irreducible representations of the tensor product of three Lie groups and projectors of an invariant Hermitian matrix.

Published on 26 Mar 2026 - 9:34

score 43 · Answer 9 · 2023-05-14 15:28:00

43

Views

Operator-valued spectral mapping theorem

Published on 14 May 2023 - 15:28

score 115 · Answer 10 · 2023-05-14 18:20:18

115

Views

Given two increasing divergent sequences $a_n, b_n$ such that $\sum_{i=1}^\infty e^{-ta_i}=\sum_{i=1}^\infty e^{-tb_i}$ is it true that $a_n=b_n$?

Published on 14 May 2023 - 18:20

score 105 · Answer 11 · 2026-02-23 15:30:45

105

Views

Does the exponential operator $e^{tA}$ defined via functional calculus and via semi group coincide?

Published on 23 Feb 2026 - 15:30

score 37 · Answer 12 · 2023-05-15 13:23:47

37

Views

What does it mean to integrate some complex valued function with respect to a projection valued measure of an operator in functional calculus?

Published on 15 May 2023 - 13:23

score 62 · Answer 13 · 2026-03-30 04:44:23

62

Views

Reference request to the theory of the spectrum of unbounded linear operators: Proof for why the spectrum of the Laplacian is discrete on compact sets

Published on 30 Mar 2026 - 4:44

score 141 · Answer 14 · 2026-03-25 01:15:18

141

Views

Intuition on unimodular graphs

Published on 25 Mar 2026 - 1:15

score 157 · Answer 15 · 2023-05-17 17:12:45

157

Views

Why is the spectrum of the identity operator on a normed space X is equal to its point spectrum.

Published on 17 May 2023 - 17:12

List Question

Spectrum of Fourier Transform

"Counterexample" to Weyl's criterion on spectrum

Check if operators are unitary equivalent

How to relate SVD and Eigendecomposition of squared complex non-symmetrical matrix

Does a symmetric matrix with only three types of values have always three types of eigenvalues?

Spectrum of a Multiplication Operator via Fourier Transform

Showing that $||(A-\lambda I)||^{-1}=\frac{1}{d(\lambda,\sigma(A))}$ for $A\in B(H)$ self-adjoint, $\lambda\in\mathbb{C}\setminus\sigma(A)$

Irreducible representations of the tensor product of three Lie groups and projectors of an invariant Hermitian matrix.

Operator-valued spectral mapping theorem

Given two increasing divergent sequences $a_n, b_n$ such that $\sum_{i=1}^\infty e^{-ta_i}=\sum_{i=1}^\infty e^{-tb_i}$ is it true that $a_n=b_n$?

Does the exponential operator $e^{tA}$ defined via functional calculus and via semi group coincide?

What does it mean to integrate some complex valued function with respect to a projection valued measure of an operator in functional calculus?

Reference request to the theory of the spectrum of unbounded linear operators: Proof for why the spectrum of the Laplacian is discrete on compact sets

Intuition on unimodular graphs

Why is the spectrum of the identity operator on a normed space X is equal to its point spectrum.

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