List questions from spectral-theory

Published on 11 Apr 2026 - 19:13

37

Views

Is there such subsequence in $L^2(\Bbb{R}^2)$.

Published on 10 May 2026 - 16:55

107

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Is it possible to obtain an expression for the spectrum of a compact embedding operator? E.g. for $I:H^1([0,1])\to L^1([0,1])$?

Published on 10 May 2026 - 17:01

39

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Eigenvalues of $\Delta u +u^p$

Published on 10 May 2026 - 14:59

335

Views

Inverse scattering transform and GLM (Gel'fand-Levitan-Marchenko) equation

Published on 10 May 2026 - 12:31

135

Views

Spectral gap of the generator of a contraction semi-group

Published on 10 May 2026 - 15:20

576

Views

Eigenvalues and spectrum of an operator on a Hilbert space

Published on 10 Apr 2026 - 22:44

86

Views

Eigenvalue Problem for Fredholm (Generalised?) Integro-Differential Equations

Published on 10 Apr 2026 - 22:10

1k

Views

Spectrum of multiplication operator

Published on 10 Apr 2026 - 14:02

30

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Why $\operatorname{Im}(\lambda-A)\neq C_{[0,1]}$?

Published on 14 Apr 2026 - 21:01

66

Views

Eigenvalue problem corresponding to a univariate differential operator

Published on 10 Apr 2026 - 6:48

100

Views

No point spectrum in $l_2$

Published on 14 Apr 2026 - 3:01

108

Views

What does it mean to have a map defined on the continuous functions on the spectrum of an operator - $ \phi_A:C(\sigma(A)) \to \mathcal{L}(H) $?

Published on 14 Apr 2026 - 17:50

299

Views

Trying to construct simple example of a 'spectral measure' $\mu_\psi$ for the expression $(\psi,f(A)\psi) = \int_{\sigma(A)} f(\lambda)d\mu_\psi$?

Published on 13 Apr 2026 - 6:19

215

Views

Skew-symmetric matrices and invariants

Published on 16 Apr 2026 - 3:19

List Question

Equivalence norm between two fundamental descompotition (krein spaces).

Is there such subsequence in $L^2(\Bbb{R}^2)$.

Is it possible to obtain an expression for the spectrum of a compact embedding operator? E.g. for $I:H^1([0,1])\to L^1([0,1])$?

Eigenvalues of $\Delta u +u^p$

Inverse scattering transform and GLM (Gel'fand-Levitan-Marchenko) equation

Spectral gap of the generator of a contraction semi-group

Eigenvalues and spectrum of an operator on a Hilbert space

Eigenvalue Problem for Fredholm (Generalised?) Integro-Differential Equations

Spectrum of multiplication operator

Why $\operatorname{Im}(\lambda-A)\neq C_{[0,1]}$?

Eigenvalue problem corresponding to a univariate differential operator

No point spectrum in $l_2$

What does it mean to have a map defined on the continuous functions on the spectrum of an operator - $ \phi_A:C(\sigma(A)) \to \mathcal{L}(H) $?

Trying to construct simple example of a 'spectral measure' $\mu_\psi$ for the expression $(\psi,f(A)\psi) = \int_{\sigma(A)} f(\lambda)d\mu_\psi$?

Skew-symmetric matrices and invariants

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