Question

Is there an operator below + and above (power of)

score 55 · Answer 1 · 2026-03-22 14:52:39

55

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Is there an operator below + and above (power of)

Published on 22 Mar 2026 - 14:52

score 43 · Answer 2 · 2026-03-25 10:34:48

43

Views

probability of two numbers picked from two distributions giving a fixed number multiplication

Published on 25 Mar 2026 - 10:34

score 275 · Answer 3 · 2026-03-26 09:16:23

275

Views

What is the operator norm of this operator?

Published on 26 Mar 2026 - 9:16

score 561 · Answer 4 · 2026-03-23 12:18:58

561

Views

Composition of bounded linear operator and an inverse of a linear operator bounded?

Published on 23 Mar 2026 - 12:18

score 204 · Answer 5 · 2026-03-19 12:32:17

204

Views

Is a $*$-representation $\pi:A\to B(H)$ non-degenerate iff $\overline{\pi(A) B(H)} = B(H)$?

Published on 19 Mar 2026 - 12:32

score 1.9k · Answer 6 · 2026-03-20 15:55:46

1.9k

Views

Do unitarily equivalent operators have the same spectrum?

Published on 20 Mar 2026 - 15:55

score 151 · Answer 7 · 2026-03-25 10:35:21

151

Views

Showing that $\inf_{\|x\|=1}\langle Tx,x\rangle$ and $\sup_{\|x\|=1}\langle Tx,x\rangle$ are eigenvalues of $T$ (in particular when they are $0$)

Published on 25 Mar 2026 - 10:35

score 77 · Answer 8 · 2018-01-29 00:51:01

77

Views

Closedness of a point evaluation operator

Published on 29 Jan 2018 - 0:51

score 112 · Answer 9 · 2026-03-25 07:04:12

112

Views

Confusion in definition of peripheral spectrum

Published on 25 Mar 2026 - 7:04

score 314 · Answer 10 · 2018-01-30 02:50:51

314

Views

Why a solution of an ODE $\dot x = \sin x$ using an exponential as a time evolution operator fails?

Published on 30 Jan 2018 - 2:50

score 78 · Answer 11 · 2026-03-25 01:27:57

78

Views

Show that $I-A$ is invertible iff $a_{k,k} \neq 1$ for all $k$

Published on 25 Mar 2026 - 1:27

score 39 · Answer 12 · 2026-03-25 04:39:20

39

Views

Do operators which admit non-orthonormal spectral expansions have any non-basis eigenvectors?

Published on 25 Mar 2026 - 4:39

score 54 · Answer 13 · 2018-02-02 05:55:04

54

Views

Two-way operator norm?

Published on 02 Feb 2018 - 5:55

score 139 · Answer 14 · 2026-03-26 11:00:23

139

Views

Proving density of $H^2(\mathbb{R})$ in $L^2(\mathbb{R})$ .

Published on 26 Mar 2026 - 11:00

score 40 · Answer 15 · 2026-03-24 20:40:25

40

Views

$\left [(A- \langle A \rangle ),\right (B- \langle B \rangle )]=\left [A,B \right ] $

Published on 24 Mar 2026 - 20:40

List Question

Is there an operator below + and above (power of)

probability of two numbers picked from two distributions giving a fixed number multiplication

What is the operator norm of this operator?

Composition of bounded linear operator and an inverse of a linear operator bounded?

Is a $*$-representation $\pi:A\to B(H)$ non-degenerate iff $\overline{\pi(A) B(H)} = B(H)$?

Do unitarily equivalent operators have the same spectrum?

Showing that $\inf_{\|x\|=1}\langle Tx,x\rangle$ and $\sup_{\|x\|=1}\langle Tx,x\rangle$ are eigenvalues of $T$ (in particular when they are $0$)

Closedness of a point evaluation operator

Confusion in definition of peripheral spectrum

Why a solution of an ODE $\dot x = \sin x$ using an exponential as a time evolution operator fails?

Show that $I-A$ is invertible iff $a_{k,k} \neq 1$ for all $k$

Do operators which admit non-orthonormal spectral expansions have any non-basis eigenvectors?

Two-way operator norm?

Proving density of $H^2(\mathbb{R})$ in $L^2(\mathbb{R})$ .

$\left [(A- \langle A \rangle ),\right (B- \langle B \rangle )]=\left [A,B \right ] $

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