List questions from unbounded-operators

Published on 02 Apr 2018 - 2:33

92

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Approximations to unbounded operators

Published on 22 Mar 2026 - 11:38

148

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Positive symmetric densely defined operator with dense range: essentially self-adjoint?

Published on 23 Apr 2018 - 21:23

98

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$A$ is self-adjoint and $X$ is bounded commuting with $A$, why $AX$ is densely defined?

Published on 28 Apr 2018 - 9:26

76

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Why can we assume that the range of the generator of a $C_0$ semigroup is already the full space?

Published on 22 Mar 2026 - 13:58

624

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Understanding the Core of an Operator or Map.

Published on 22 Mar 2026 - 15:04

977

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Bloch's theorem in one dimension, confusion about proof

Published on 21 May 2018 - 2:28

29

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$A$ is bounded if $\displaystyle\lim_{h\to 0}\|e^{ihA}-{\rm id}_\mathcal{H}\|=0$

Published on 24 May 2018 - 14:43

169

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Cayley transform for unbounded operator M(f)(t)=t(f)(t)

Published on 29 May 2018 - 11:13

3.3k

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Show that a compact operator is bounded

Published on 22 Mar 2026 - 12:34

62

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Example of Range-Kernel relation on unbounded operators.

Published on 08 Jun 2018 - 14:08

379

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Domain of sum of self-adjoint operators $A \otimes 1 + 1 \otimes B$?

Published on 28 Jun 2018 - 13:03

78

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Question about Hilbert Space

Published on 21 Mar 2026 - 21:05

1.4k

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Unbounded differential operator in $C^1.$

Published on 22 Mar 2026 - 12:15

255

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Spectrum of two operators

Published on 21 Mar 2026 - 22:40

List Question

von Neumann-Liouville expansion in Quantume Field Theory

Approximations to unbounded operators

Positive symmetric densely defined operator with dense range: essentially self-adjoint?

$A$ is self-adjoint and $X$ is bounded commuting with $A$, why $AX$ is densely defined?

Why can we assume that the range of the generator of a $C_0$ semigroup is already the full space?

Understanding the Core of an Operator or Map.

Bloch's theorem in one dimension, confusion about proof

$A$ is bounded if $\displaystyle\lim_{h\to 0}\|e^{ihA}-{\rm id}_\mathcal{H}\|=0$

Cayley transform for unbounded operator M(f)(t)=t(f)(t)

Show that a compact operator is bounded

Example of Range-Kernel relation on unbounded operators.

Domain of sum of self-adjoint operators $A \otimes 1 + 1 \otimes B$?

Question about Hilbert Space

Unbounded differential operator in $C^1.$

Spectrum of two operators

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