List questions from spectral-theory

Published on 12 Jan 2019 - 23:00

193

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Prove that there is no self-adjoint extension using deficiency indices

Published on 26 Mar 2026 - 9:12

531

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Possible spectra of singular Sturm-Liouville problems

Published on 14 Jan 2019 - 22:37

45

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Sequence $(u_n)$ such that

Published on 15 Jan 2019 - 11:51

1.5k

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Equivalence of definitions for the approximate point spectrum

Published on 15 Jan 2019 - 18:55

147

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Converse of the Spectral Theorem

Published on 16 Jan 2019 - 6:25

152

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"bounding" an unbounded operator

Published on 25 Mar 2026 - 2:57

254

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Find projection-valued measure associated with parity operator

Published on 19 Jan 2019 - 0:53

283

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Spectrum of Derivative Operator

Published on 22 Jan 2019 - 3:19

48

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Show that this second type Fredholm equation doesn't admit a solution using fredholm theorems

Published on 25 Mar 2026 - 15:41

215

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Construct operator with given spectrum.

Published on 25 Mar 2026 - 7:38

850

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RAGE theorem for absolutely continuous spectrum?

Published on 25 Mar 2026 - 6:09

682

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Invertible elements in $l^1(\mathbb Z)$

Published on 25 Mar 2026 - 20:17

79

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Von Neumann ergodic theorem for purely continuous spectrum

Published on 26 Mar 2026 - 10:58

503

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A self-adjoint operator without eigenvalues and with spectrum equal to {0}

Published on 25 Mar 2026 - 6:09

List Question

Self-adjoint element of $C^*$-algebra has real spectrum

Prove that there is no self-adjoint extension using deficiency indices

Possible spectra of singular Sturm-Liouville problems

Sequence $(u_n)$ such that

Equivalence of definitions for the approximate point spectrum

Converse of the Spectral Theorem

"bounding" an unbounded operator

Find projection-valued measure associated with parity operator

Spectrum of Derivative Operator

Show that this second type Fredholm equation doesn't admit a solution using fredholm theorems

Construct operator with given spectrum.

RAGE theorem for absolutely continuous spectrum?

Invertible elements in $l^1(\mathbb Z)$

Von Neumann ergodic theorem for purely continuous spectrum

A self-adjoint operator without eigenvalues and with spectrum equal to {0}

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