List questions from spectral-theory

Published on 10 Sep 2011 - 17:06

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Construct a multiplication operator which has dense point spectrum

Published on 10 Sep 2011 - 21:28

379

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Do the maximum and minimum values of a Laplacian eigenfunction have the same magnitude?

Published on 16 Sep 2011 - 7:57

337

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Densely-defined linear functionals and the spectrum of the adjoint operator

Published on 19 Sep 2011 - 13:40

564

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Spectrum of a "quasi" right shift operator

Published on 02 Oct 2011 - 22:51

682

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Ascent and descent for a bounded linear operator

Published on 10 Oct 2011 - 7:49

427

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Unitary Operator as a complex valued function

Published on 19 Oct 2011 - 16:56

206

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reference for strongly continuous semi-groups

Published on 30 Mar 2026 - 15:35

178

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A question on strongly continuous semi-groups

Published on 23 Oct 2011 - 19:57

662

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Nonexistence of a cyclic vector for a representation on $\ell^2(\mathbb{Z})$

Published on 08 Nov 2011 - 23:40

2.7k

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Eigenvalues of doubly stochastic matrices

Published on 09 Nov 2011 - 3:01

707

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Spectral Measures: References

Published on 11 Nov 2011 - 0:58

443

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Prove $\forall$ compact $M:\ M \subset C\quad \exists A:l_2\rightarrow l_2, \sigma(A)=M$

Published on 19 Nov 2011 - 15:10

1k

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Simple isolated eigenvalue and pole of the resolvent

Published on 27 Nov 2011 - 10:49

219

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Find spectrum of $Af (x) = \int\limits_0^\pi \sum\limits_{n=1}^\infty 5^{-n} \cos(nx)\cos(nt) f(t)\;dt$

Published on 30 Nov 2011 - 15:29

List Question

Continuous spectrum can shrink to an isolated point

Construct a multiplication operator which has dense point spectrum

Do the maximum and minimum values of a Laplacian eigenfunction have the same magnitude?

Densely-defined linear functionals and the spectrum of the adjoint operator

Spectrum of a "quasi" right shift operator

Ascent and descent for a bounded linear operator

Unitary Operator as a complex valued function

reference for strongly continuous semi-groups

A question on strongly continuous semi-groups

Nonexistence of a cyclic vector for a representation on $\ell^2(\mathbb{Z})$

Eigenvalues of doubly stochastic matrices

Spectral Measures: References

Prove $\forall$ compact $M:\ M \subset C\quad \exists A:l_2\rightarrow l_2, \sigma(A)=M$

Simple isolated eigenvalue and pole of the resolvent

Find spectrum of $Af (x) = \int\limits_0^\pi \sum\limits_{n=1}^\infty 5^{-n} \cos(nx)\cos(nt) f(t)\;dt$

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