List questions from operator-theory

Published on 05 Apr 2026 - 15:44

83

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A surjective linear operator - Hilbert spaces

Published on 08 Apr 2026 - 18:04

245

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(Proof Updated, Verification in Need) Show that $(s,t)\mapsto t\wedge s$ for $s,t\geq 0$ and $(s,t)\mapsto e^{-|t-s|}$ are positive semi-definite.

Published on 26 Mar 2026 - 12:50

90

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Two definitions of strict topology

Published on 09 Apr 2026 - 1:23

93

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Example of a function in $L^2(\mathbb{R})$ whose second derivate is not in $L^2(\mathbb{R})$

Published on 28 Mar 2026 - 22:26

231

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Umbral calculus - eigenfunctions of operator

Published on 11 Apr 2026 - 9:07

140

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Why does the equation hold?

Published on 31 Mar 2026 - 20:59

40

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Linear operator from space to subspace is bounded

Published on 12 Apr 2026 - 0:07

141

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Bounded Linear operators on sum of countably infinite vectors

Published on 12 Apr 2026 - 18:51

40

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Is the set of compact operators on a complex infinite dimensional Hilbert space compact?

Published on 27 Mar 2026 - 1:45

101

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Invertibility of Hermitian Square

Published on 30 Mar 2026 - 13:20

61

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Relation between one dimensional Schrodinger's operator and Riemann hypothesis

Published on 25 Mar 2026 - 17:36

75

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Unbounded operators with dense domain in Banach space.

Published on 25 Mar 2026 - 10:54

148

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Functional Analysis: Projection linear operator

Published on 08 Apr 2026 - 17:40

48

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An example of unbounded isometry

Published on 10 Apr 2026 - 0:05

List Question

uniform limit of kernels

A surjective linear operator - Hilbert spaces

(Proof Updated, Verification in Need) Show that $(s,t)\mapsto t\wedge s$ for $s,t\geq 0$ and $(s,t)\mapsto e^{-|t-s|}$ are positive semi-definite.

Two definitions of strict topology

Example of a function in $L^2(\mathbb{R})$ whose second derivate is not in $L^2(\mathbb{R})$

Umbral calculus - eigenfunctions of operator

Why does the equation hold?

Linear operator from space to subspace is bounded

Bounded Linear operators on sum of countably infinite vectors

Is the set of compact operators on a complex infinite dimensional Hilbert space compact?

Invertibility of Hermitian Square

Relation between one dimensional Schrodinger's operator and Riemann hypothesis

Unbounded operators with dense domain in Banach space.

Functional Analysis: Projection linear operator

An example of unbounded isometry

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