List questions from operator-theory

Published on 13 Apr 2026 - 16:18

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linear map on Banach space

Published on 13 Apr 2026 - 17:42

471

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Prove a matrix is Hermitian using bra ket notation

Published on 11 Apr 2026 - 22:22

245

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How to find the norm of this operator

Published on 08 Apr 2026 - 18:29

102

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Why is $e^\mathrm{D}f(x)=f(x+1)$?

Published on 14 Apr 2026 - 5:50

527

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If this operator is an isometry, does that imply it is not compact?

Published on 10 Apr 2026 - 22:43

419

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Restriction of compact self adjoint operator to a closed subspace.

Published on 10 Apr 2026 - 15:22

100

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cluster points of sequence in intersection set

Published on 15 Apr 2026 - 12:20

104

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Norm of linear operator 3

Published on 10 Apr 2026 - 10:48

1.3k

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Closed linear operators have closed kernels

Published on 12 Apr 2026 - 15:23

375

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Projection properties in Hilbert space

Published on 14 Apr 2026 - 0:22

544

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The sum of eigenvalues of integral operator $S(f)(x)=\int_{\mathcal{X}} k(x,y)f(y)d\mu(y)$ is given by $\int_{\mathcal{X}} k(x,x) d\mu(x)$?

Published on 16 Apr 2026 - 11:58

44

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Is $1-x$ invertible in Banach algebra

Published on 14 Apr 2026 - 1:24

346

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Does absolutely convergent trace series imply that the operator is of trace class?

Published on 10 Apr 2026 - 6:45

42

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Proving closeness and density

Published on 13 Apr 2026 - 4:16

List Question

Continuity in the weak operator topology implies continuity in the strong op. top.?

linear map on Banach space

Prove a matrix is Hermitian using bra ket notation

How to find the norm of this operator

Why is $e^\mathrm{D}f(x)=f(x+1)$?

If this operator is an isometry, does that imply it is not compact?

Restriction of compact self adjoint operator to a closed subspace.

cluster points of sequence in intersection set

Norm of linear operator 3

Closed linear operators have closed kernels

Projection properties in Hilbert space

The sum of eigenvalues of integral operator $S(f)(x)=\int_{\mathcal{X}} k(x,y)f(y)d\mu(y)$ is given by $\int_{\mathcal{X}} k(x,x) d\mu(x)$?

Is $1-x$ invertible in Banach algebra

Does absolutely convergent trace series imply that the operator is of trace class?

Proving closeness and density

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