List questions from spectral-theory

Published on 15 Oct 2017 - 6:58

38

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$\int \lambda d E_\lambda^A \cdot \int( 1/\lambda) \chi_{(0,\infty)} d E_\lambda^A =?$

Published on 24 Feb 2026 - 3:45

34

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Bound on product of functional calculus

Published on 24 Feb 2026 - 3:49

63

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Questions about spectral measure

Published on 24 Oct 2017 - 17:01

108

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Inequality for eigenvalues of two positive definite matrices

Published on 30 Oct 2017 - 18:50

1.7k

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Exponential of unbounded normal operator

Published on 01 Nov 2017 - 12:49

362

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Properties of Borel functional calculus for unbounded normal operators

Published on 03 Nov 2017 - 12:28

897

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spectral projector of the Laplacian on $\mathbb{R}^d$

Published on 03 Nov 2017 - 19:55

87

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Proving $(\lambda^{-1}-A^{-1})^{-1}=\lambda-\lambda^2(\lambda-A)^{-1}$

Published on 24 Feb 2026 - 5:30

513

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Operator norm using spectral theorem

Published on 30 Mar 2026 - 0:14

55

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Proof of $\sigma(zA) = z\sigma(A)$

Published on 08 Nov 2017 - 20:01

284

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trying to prove convergence of a fixed point iteration

Published on 28 Mar 2026 - 12:02

684

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Borel Functional Calculus of Commuting Operators

Published on 24 Feb 2026 - 5:33

186

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Boundedness of $m$-dissipative operator

Published on 28 Mar 2026 - 17:00

182

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spectral projector on infinite strips and half spaces

Published on 10 Nov 2017 - 16:51

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Intuition/Motivation behind resolutions to the identity

$\int \lambda d E_\lambda^A \cdot \int( 1/\lambda) \chi_{(0,\infty)} d E_\lambda^A =?$

Bound on product of functional calculus

Questions about spectral measure

Inequality for eigenvalues of two positive definite matrices

Exponential of unbounded normal operator

Properties of Borel functional calculus for unbounded normal operators

spectral projector of the Laplacian on $\mathbb{R}^d$

Proving $(\lambda^{-1}-A^{-1})^{-1}=\lambda-\lambda^2(\lambda-A)^{-1}$

Operator norm using spectral theorem

Proof of $\sigma(zA) = z\sigma(A)$

trying to prove convergence of a fixed point iteration

Borel Functional Calculus of Commuting Operators

Boundedness of $m$-dissipative operator

spectral projector on infinite strips and half spaces

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