List questions from adjoint-operators | MathQA

Different answers for adjoint of $T : \ell^2 \to \ell^2$ such that $T(x_1, x_2, \dots) = (c_1 x_1, c_2 x_2, \dots),$ where's the mistake?

Published on 08 Dec 2022 - 1:03

Bessel sequence ,frame sequence in Hilbert Space

Published on 15 Dec 2022 - 13:07

Spectral Representation of $T$

Published on 28 Dec 2022 - 7:16

How can I finish my proof that $||A^*A||=||A||^2$?

Published on 04 Jan 2023 - 18:58

Differential Operators on Bessel Functions

Published on 06 Jan 2023 - 0:12

Find adjoint to integral operator from $H^1$ to $L_2$

Published on 25 Mar 2026 - 17:24

Derivative of adjoint operator-valued function

Published on 17 Jan 2023 - 12:01

Prove that $\{T_v: \|v\|\leq 1\}$ is a family of pointwise uniformly bounded functionals

Published on 18 Jan 2023 - 21:37

Derivative self-adjoint operator

Published on 27 Mar 2026 - 16:19

Show that if $u\circ u^{\star} = u^{\star}\circ u$ then $\ker(u^{\star})=\ker(u)$

Published on 23 Jan 2023 - 17:47

Question about operators from $\mathbb{R}^\mathbb{N}$ to/from a real separable Hilbert space.

Published on 25 Jan 2023 - 3:32