List questions from spectral-theory

Published on 26 Mar 2026 - 16:05

129

Views

Functions of the same self-adjoint operator commute on Hilbert space

Published on 20 Nov 2020 - 22:18

74

Views

Point spectrum (eigenvalues) of two operators in $l^2$.

Published on 22 Nov 2020 - 4:00

62

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Sufficient criteria for the spectrum of a bounded operator to be convex.

Published on 23 Nov 2020 - 15:00

108

Views

Strict inclusions in spectral mapping theorem

Published on 28 Nov 2020 - 15:56

117

Views

Is $\frac{d^2}{dx^2} + \frac{1}{4}x^2$ Self-Adjoint? Is this argument for it being Self-Adjoint correct?

Published on 01 Dec 2020 - 23:51

244

Views

Reference for coercive property

Published on 05 Apr 2026 - 22:09

36

Views

Find Spectral decomposition of $\mathrm{adj}\ A$ matrix

Published on 03 Dec 2020 - 15:48

66

Views

Showing a map is orthogonal projection

Published on 03 Dec 2020 - 18:20

355

Views

Is continuous spectrum closed?

Published on 08 Apr 2026 - 2:56

66

Views

Eigenvalues of circulant using spectral mapping

Published on 25 Mar 2026 - 13:59

222

Views

Looking for spectrum of an operator

Published on 07 Dec 2020 - 3:46

736

Views

Intuition behind spectrum of an operator

Published on 10 Dec 2020 - 16:23

191

Views

Chebyshev differentiation matrices and Galerkin method

Published on 26 Mar 2026 - 3:18

47

Views

Laplace eigenfunction on a polygonal domain symmetric about an axis

Published on 28 Mar 2026 - 8:08

List Question

Countinuous spectrum of multiplication operator on $L^{2}(\mathbb{R})$

Functions of the same self-adjoint operator commute on Hilbert space

Point spectrum (eigenvalues) of two operators in $l^2$.

Sufficient criteria for the spectrum of a bounded operator to be convex.

Strict inclusions in spectral mapping theorem

Is $\frac{d^2}{dx^2} + \frac{1}{4}x^2$ Self-Adjoint? Is this argument for it being Self-Adjoint correct?

Reference for coercive property

Find Spectral decomposition of $\mathrm{adj}\ A$ matrix

Showing a map is orthogonal projection

Is continuous spectrum closed?

Eigenvalues of circulant using spectral mapping

Looking for spectrum of an operator

Intuition behind spectrum of an operator

Chebyshev differentiation matrices and Galerkin method

Laplace eigenfunction on a polygonal domain symmetric about an axis

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