List questions from operator-theory

Published on 23 Mar 2026 - 12:27

113

Views

$B$ is a Banach algebra which is a division algebra, then there is a unique isometric isomorphism of $B$ on to $\mathbb{C}$

Published on 25 Mar 2026 - 12:21

139

Views

Positivity of adjoint eigenfunctions to Hilbert-Schmidt integral operator on real Hilbert spaces

Published on 26 Mar 2026 - 4:31

136

Views

Is the exponencial of an operator a definition?

Published on 18 Apr 2018 - 21:42

18

Views

Find the projection in the subspacing where the vector $X = (1,3,-1,3)$ originates from the vectors $A_1 (1, -1,1,1), A_2 (5,1,-3,3).$

Published on 19 Apr 2018 - 9:07

1k

Views

Spectrum of isometry

Published on 19 Apr 2018 - 18:46

92

Views

Are there simple conditions on a Fréchet differentiable function on a Hilbert space that ensure that the Fréchet derivatives are trace-class?

Published on 25 Mar 2026 - 5:18

30

Views

Frechet derivative of a characteristic fucntion

Published on 25 Mar 2026 - 5:11

66

Views

On a question of projection in complex Hilbert space

Published on 25 Mar 2026 - 12:53

870

Views

Differential Operators as vectors

Published on 27 Mar 2026 - 19:51

75

Views

Partial trace for nuclear operators on a projective tensor product

Published on 25 Mar 2026 - 10:52

57

Views

The spectrum of a linear operator

Published on 21 Apr 2018 - 19:29

3.4k

Views

How to find the inverse operator?

Published on 22 Apr 2018 - 9:25

182

Views

Is $I-2T$ self-adjoint for a rank-one operator $\,Tx=\langle\,x\mid u\,\rangle u\,$ on Hilbert space with $\|u\|=1$?

Published on 25 Mar 2026 - 22:04

495

Views

Is $|\langle Ax,x\rangle| \leq \langle |A|x,x\rangle$ in a complex Hilbert space?

Published on 25 Mar 2026 - 10:55

List Question

Transform $\cosh(x)$ into $\exp(x^2/2)$

$B$ is a Banach algebra which is a division algebra, then there is a unique isometric isomorphism of $B$ on to $\mathbb{C}$

Positivity of adjoint eigenfunctions to Hilbert-Schmidt integral operator on real Hilbert spaces

Is the exponencial of an operator a definition?

Find the projection in the subspacing where the vector $X = (1,3,-1,3)$ originates from the vectors $A_1 (1, -1,1,1), A_2 (5,1,-3,3).$

Spectrum of isometry

Are there simple conditions on a Fréchet differentiable function on a Hilbert space that ensure that the Fréchet derivatives are trace-class?

Frechet derivative of a characteristic fucntion

On a question of projection in complex Hilbert space

Differential Operators as vectors

Partial trace for nuclear operators on a projective tensor product

The spectrum of a linear operator

How to find the inverse operator?

Is $I-2T$ self-adjoint for a rank-one operator $\,Tx=\langle\,x\mid u\,\rangle u\,$ on Hilbert space with $\|u\|=1$?

Is $|\langle Ax,x\rangle| \leq \langle |A|x,x\rangle$ in a complex Hilbert space?

Trending Questions

Popular # Hahtags

Popular Questions