List questions from unbounded-operators

Published on 13 Apr 2026 - 6:18

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Cesaro average semigroup

Published on 10 May 2026 - 17:33

56

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Convergence to the differential operator

Published on 01 Apr 2026 - 5:28

466

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Show that if $\phi \circ T$ is bounded for every $\phi\in Y^*$ then $T$ is bounded

Published on 16 Apr 2026 - 11:31

62

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prove d/dx is bounded on L^2

Published on 15 Apr 2026 - 19:49

235

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If operator is closed and densely defined then $D(A^*)^\perp = \{0\}$

Published on 09 Apr 2026 - 8:30

37

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Are "lower bound" and "upper bound" unambigous? What if one's in the negative axis?

Published on 15 Apr 2026 - 18:03

1k

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Adjoint of multiplication operator

Published on 09 Apr 2026 - 9:55

530

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Example of unbounded operators defined on the entire complete space

Published on 14 Apr 2026 - 19:05

60

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operator core of a fourier multiplier

Published on 10 Apr 2026 - 8:33

753

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Hahn Banach Theorem implying existence of a nonzero linear functional taking 0 in a linear subspace

Published on 06 May 2026 - 12:24

205

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Why adjoint operator is not a generalization of transpose matrix?

Published on 12 Apr 2026 - 14:27

62

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Proof of strong limit $\displaystyle s-\lim_{\varepsilon \to 0} (I+i\varepsilon A)^{-1}=I$

Published on 10 May 2026 - 18:45

66

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How is this operator well defined? $\frac{D}{(1+D^2)^{1/2} }$.

Published on 14 Apr 2026 - 4:08

88

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Meaning of Hilbert space adjointable

Published on 14 Apr 2026 - 17:52

List Question

Every nonempty closed subset $M\subset \mathbb C$ is the spectrum of a closed operator

Cesaro average semigroup

Convergence to the differential operator

Show that if $\phi \circ T$ is bounded for every $\phi\in Y^*$ then $T$ is bounded

prove d/dx is bounded on L^2

If operator is closed and densely defined then $D(A^*)^\perp = \{0\}$

Are "lower bound" and "upper bound" unambigous? What if one's in the negative axis?

Adjoint of multiplication operator

Example of unbounded operators defined on the entire complete space

operator core of a fourier multiplier

Hahn Banach Theorem implying existence of a nonzero linear functional taking 0 in a linear subspace

Why adjoint operator is not a generalization of transpose matrix?

Proof of strong limit $\displaystyle s-\lim_{\varepsilon \to 0} (I+i\varepsilon A)^{-1}=I$

How is this operator well defined? $\frac{D}{(1+D^2)^{1/2} }$.

Meaning of Hilbert space adjointable

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