List questions from operator-theory

Published on 26 Mar 2026 - 2:33

223

Views

Does the carré du champ operator associated with the generator of a contractive $C^0$-semigroup on a Hilbert space have the diffusion property?

Published on 25 Mar 2026 - 11:04

90

Views

Is an operator between Hilbert spaces bounded iff the adjoint is bounded?

Published on 26 Mar 2026 - 13:51

116

Views

Is the inverse of the position operator compact?

Published on 25 Mar 2019 - 9:01

1k

Views

Adjoint of multiplication operator

Published on 01 Apr 2026 - 10:08

49

Views

On the positivity of the positive part of a closed symmetric operator?

Published on 26 Mar 2019 - 15:58

921

Views

Infinite Matrix Multiplication

Published on 01 Apr 2026 - 5:02

44

Views

Bochner integral on non complete space

Published on 25 Mar 2026 - 23:51

51

Views

If $r(A)=\omega(A)$, is $r(A)=\|A\|$?

Published on 29 Mar 2026 - 5:11

46

Views

multiplier algebra of a non-unital $C^*$ algebra

Published on 27 Mar 2026 - 7:18

80

Views

$K$ Theory of Operators II, Higson's notes

Published on 25 Mar 2026 - 1:16

203

Views

Let $A: X \rightarrow Y$ a bijective continous map between two Banach spaces X and Y. Then, $A^{-1}$ is also continous?

Published on 25 Mar 2026 - 16:03

246

Views

Can norm of resolvent of closed operator grow away from its spectrum(but near to its numerical range)

Published on 25 Mar 2026 - 11:04

80

Views

T attains its norm, then $T^*$ attains its norm

Published on 29 Mar 2026 - 19:33

30

Views

Behaviour of Maximal tenor product with inductive limits

Published on 27 Mar 2026 - 23:00

List Question

Sum operator precedence

Does the carré du champ operator associated with the generator of a contractive $C^0$-semigroup on a Hilbert space have the diffusion property?

Is an operator between Hilbert spaces bounded iff the adjoint is bounded?

Is the inverse of the position operator compact?

Adjoint of multiplication operator

On the positivity of the positive part of a closed symmetric operator?

Infinite Matrix Multiplication

Bochner integral on non complete space

If $r(A)=\omega(A)$, is $r(A)=\|A\|$?

multiplier algebra of a non-unital $C^*$ algebra

$K$ Theory of Operators II, Higson's notes

Let $A: X \rightarrow Y$ a bijective continous map between two Banach spaces X and Y. Then, $A^{-1}$ is also continous?

Can norm of resolvent of closed operator grow away from its spectrum(but near to its numerical range)

T attains its norm, then $T^*$ attains its norm

Behaviour of Maximal tenor product with inductive limits

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