List questions from unbounded-operators

Published on 11 Apr 2026 - 12:23

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Approximations to unbounded operators

Published on 13 Apr 2026 - 3:06

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

Published on 09 Apr 2026 - 13:27

101

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

Published on 10 Apr 2026 - 17:45

84

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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 06 May 2026 - 9:11

627

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Understanding the Core of an Operator or Map.

Published on 11 Apr 2026 - 11:27

980

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Bloch's theorem in one dimension, confusion about proof

Published on 15 Apr 2026 - 6:18

32

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

Published on 14 Apr 2026 - 17:49

172

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

Published on 16 Apr 2026 - 13:16

3.3k

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Show that a compact operator is bounded

Published on 10 Apr 2026 - 3:04

65

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Example of Range-Kernel relation on unbounded operators.

Published on 10 Apr 2026 - 20:04

382

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

Published on 14 Apr 2026 - 6:18

82

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Question about Hilbert Space

Published on 11 Apr 2026 - 23:12

1.4k

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Unbounded differential operator in $C^1.$

Published on 14 Apr 2026 - 8:59

259

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Spectrum of two operators

Published on 11 Apr 2026 - 15:44

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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