List questions from unbounded-operators

Published on 25 Jan 2019 - 17:40

27

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Cesaro average semigroup

Published on 22 Mar 2026 - 8:58

54

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Convergence to the differential operator

Published on 22 Mar 2026 - 15:50

463

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

Published on 17 Feb 2019 - 11:04

59

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prove d/dx is bounded on L^2

Published on 17 Mar 2019 - 19:53

232

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

Published on 20 Mar 2019 - 21:39

34

Views

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

Published on 22 Mar 2019 - 18:25

1k

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Adjoint of multiplication operator

Published on 25 Mar 2019 - 19:56

527

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Example of unbounded operators defined on the entire complete space

Published on 26 Mar 2019 - 7:41

58

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operator core of a fourier multiplier

Published on 29 Mar 2019 - 6:35

748

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

Published on 17 Mar 2026 - 2:44

202

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Why adjoint operator is not a generalization of transpose matrix?

Published on 11 Apr 2019 - 13:55

60

Views

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

Published on 23 Mar 2026 - 12:43

63

Views

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

Published on 18 Apr 2019 - 7:12

84

Views

Meaning of Hilbert space adjointable

Published on 02 May 2019 - 10:06

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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