List questions from operator-theory

Published on 11 Apr 2026 - 22:56

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Extensions of $\mathbb{Q}$-linear operators

Published on 13 Apr 2026 - 22:15

114

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Fejer monotone sequence

Published on 10 Apr 2026 - 10:44

327

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Which elements can differ between the spectrum and essential spectrum?

Published on 11 Apr 2026 - 22:32

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Is $\Delta$ self adjoint?

Published on 09 Apr 2026 - 0:52

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how do I find the spectrum.......?

Published on 08 Apr 2026 - 23:11

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Is any derivation from a $c^*$ - algebra $A$ into its double centralizer inner?

Published on 14 Apr 2026 - 12:02

68

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the spectrum of banach algebra

Published on 12 Apr 2026 - 18:42

195

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spectrum of a banach algebra A

Published on 11 Apr 2026 - 3:14

80

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Let $\mathcal{H}$ denote a separable Hilbert space. Construct a nonzero operator $T \in B(\mathcal{H})$ such that $T^2 = 0$.

Published on 14 Apr 2026 - 17:39

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Show that $T$ in $\ell^2(\mathbb{N})$ is a bounded linear operator and compute the operator norm $\|T\|$

Published on 14 Apr 2026 - 15:52

212

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Maximal ideals of abelian Banach algebras

Published on 12 Apr 2026 - 2:16

141

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Showing that $Tf = \int_A K(x,y) f(y) dy$ is compact where $A$ is the unit circle?

Published on 15 Apr 2026 - 5:09

28

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Semigroup generation

Published on 26 Mar 2026 - 8:04

60

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Are transformations dense in operators?

Published on 10 Apr 2026 - 12:55

List Question

Strong operator convergence of an uncountable series

Extensions of $\mathbb{Q}$-linear operators

Fejer monotone sequence

Which elements can differ between the spectrum and essential spectrum?

Is $\Delta$ self adjoint?

how do I find the spectrum.......?

Is any derivation from a $c^*$ - algebra $A$ into its double centralizer inner?

the spectrum of banach algebra

spectrum of a banach algebra A

Let $\mathcal{H}$ denote a separable Hilbert space. Construct a nonzero operator $T \in B(\mathcal{H})$ such that $T^2 = 0$.

Show that $T$ in $\ell^2(\mathbb{N})$ is a bounded linear operator and compute the operator norm $\|T\|$

Maximal ideals of abelian Banach algebras

Showing that $Tf = \int_A K(x,y) f(y) dy$ is compact where $A$ is the unit circle?

Semigroup generation

Are transformations dense in operators?

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