List questions from spectral-theory

Published on 25 Mar 2026 - 11:13

1k

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The spectrum of a product of operators

Published on 14 Oct 2014 - 0:02

88

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Some doubts concerning spectral theory.

Published on 27 Mar 2026 - 9:58

1.6k

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Eigenvalues of Hankel matrices

Published on 14 Oct 2014 - 23:22

130

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Spectral measure and commutativity.

Published on 14 Oct 2014 - 23:59

135

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Simple proof that $\|p(A)\|\le \sup_{|z|\le 1}|p(z)|$ for polynomials $p$ and $\|A\| \le 1$.

Published on 15 Oct 2014 - 5:49

566

Views

Spectrum of multiplication operator by the independent variable in $L^2$

Published on 15 Oct 2014 - 14:47

938

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Multiplication operator on $L^2$ and spectral theorem.

Published on 15 Oct 2014 - 20:13

2.1k

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Eigenvalues of tridiagonal matrix

Published on 25 Mar 2026 - 3:17

156

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On calculating spectral projections

Published on 17 Oct 2014 - 5:21

288

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spectral projection of an element in a C*-algebra

Published on 27 Mar 2026 - 4:34

409

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A Direct Proof of Representation Theorem for Positive Harmonic Functions in the Half Plane?

Published on 18 Oct 2014 - 21:48

332

Views

Spectral Measures: Spectral Spaces (I)

Published on 21 Oct 2014 - 16:10

168

Views

How to show a Borel Operator Measure dilates to a Spectral Measure?

Published on 21 Oct 2014 - 20:23

27

Views

Showing T intertwines $D_T$ and $D_{T^*}$ using Spectral Theorem

Published on 23 Oct 2014 - 1:25

List Question

A question about the article 'You can't hear the shape of a drum'

The spectrum of a product of operators

Some doubts concerning spectral theory.

Eigenvalues of Hankel matrices

Spectral measure and commutativity.

Simple proof that $\|p(A)\|\le \sup_{|z|\le 1}|p(z)|$ for polynomials $p$ and $\|A\| \le 1$.

Spectrum of multiplication operator by the independent variable in $L^2$

Multiplication operator on $L^2$ and spectral theorem.

Eigenvalues of tridiagonal matrix

On calculating spectral projections

spectral projection of an element in a C*-algebra

A Direct Proof of Representation Theorem for Positive Harmonic Functions in the Half Plane?

Spectral Measures: Spectral Spaces (I)

How to show a Borel Operator Measure dilates to a Spectral Measure?

Showing T intertwines $D_T$ and $D_{T^*}$ using Spectral Theorem

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