Question

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

score 58 · Answer 1 · 2026-04-11 17:52:35

58

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

Published on 11 Apr 2026 - 17:52

score 48 · Answer 2 · 2026-05-10 14:57:10

48

Views

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

Published on 10 May 2026 - 14:57

score 277 · Answer 3 · 2026-05-10 14:55:47

277

Views

What is the operator norm of this operator?

Published on 10 May 2026 - 14:55

score 567 · Answer 4 · 2026-04-29 12:44:21

567

Views

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

Published on 29 Apr 2026 - 12:44

score 210 · Answer 5 · 2026-05-03 12:09:58

210

Views

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

Published on 03 May 2026 - 12:09

score 1.9k · Answer 6 · 2026-05-07 07:35:05

1.9k

Views

Do unitarily equivalent operators have the same spectrum?

Published on 07 May 2026 - 7:35

score 157 · Answer 7 · 2026-04-29 12:08:02

157

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 29 Apr 2026 - 12:08

score 81 · Answer 8 · 2026-04-09 13:18:25

81

Views

Closedness of a point evaluation operator

Published on 09 Apr 2026 - 13:18

score 115 · Answer 9 · 2026-04-23 00:37:08

115

Views

Confusion in definition of peripheral spectrum

Published on 23 Apr 2026 - 0:37

score 319 · Answer 10 · 2026-04-16 20:17:51

319

Views

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

Published on 16 Apr 2026 - 20:17

score 81 · Answer 11 · 2026-05-10 17:18:01

81

Views

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

Published on 10 May 2026 - 17:18

score 43 · Answer 12 · 2026-05-10 16:02:18

43

Views

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

Published on 10 May 2026 - 16:02

score 59 · Answer 13 · 2026-04-10 10:06:45

59

Views

Two-way operator norm?

Published on 10 Apr 2026 - 10:06

score 142 · Answer 14 · 2026-05-10 12:34:01

142

Views

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

Published on 10 May 2026 - 12:34

score 44 · Answer 15 · 2026-05-10 11:19:57

44

Views

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

Published on 10 May 2026 - 11:19

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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