List questions from operator-theory

Published on 13 Apr 2026 - 21:27

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Do the following $l_1$-functionals attain their norm?

Published on 11 Apr 2026 - 23:58

823

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Prove that operator is Zero operator.

Published on 10 May 2026 - 16:57

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Integral Gronwall Estimate for Operators.

Published on 10 May 2026 - 10:55

24

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Find the coefficient polynomials $Q_k(x)$ of $T$ in the representation $T = \sum_{k=0}^{\infty} Q_k(x)D^k$.

Published on 15 Apr 2026 - 18:56

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Composition of regularized inverse of linear operator on dense subspace converges on whole space?

Published on 05 May 2026 - 2:16

134

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Prove that $U_{\alpha}$ is a family of unitary operators

Published on 10 May 2026 - 17:00

45

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$\|T\| \neq \sup_{\|h\|=1} |\langle Th,h\rangle |$

Published on 10 May 2026 - 15:55

109

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Spectral Measure of Unitary Operators

Published on 10 May 2026 - 14:57

56

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Product between normal and hyponormal operators which commute is hyponormal

Published on 10 May 2026 - 19:46

34

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question related to the norm of bounded linear operator

Published on 10 May 2026 - 19:35

3.6k

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Spectrum of unitary operators lie in the unit circle

Published on 10 May 2026 - 15:02

60

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Bound and norm of operator

Published on 10 May 2026 - 20:05

670

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Letting $x_n\to x$ weakly in a normed vector space $X$, prove the following statement.

Published on 10 May 2026 - 12:54

293

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Spectrum of a linear operator

Published on 10 May 2026 - 9:12

List Question

The set of surjective operatrs between normed spaces

Do the following $l_1$-functionals attain their norm?

Prove that operator is Zero operator.

Integral Gronwall Estimate for Operators.

Find the coefficient polynomials $Q_k(x)$ of $T$ in the representation $T = \sum_{k=0}^{\infty} Q_k(x)D^k$.

Composition of regularized inverse of linear operator on dense subspace converges on whole space?

Prove that $U_{\alpha}$ is a family of unitary operators

$\|T\| \neq \sup_{\|h\|=1} |\langle Th,h\rangle |$

Spectral Measure of Unitary Operators

Product between normal and hyponormal operators which commute is hyponormal

question related to the norm of bounded linear operator

Spectrum of unitary operators lie in the unit circle

Bound and norm of operator

Letting $x_n\to x$ weakly in a normed vector space $X$, prove the following statement.

Spectrum of a linear operator

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