Norm of the Resolvent of a Self-Adjoint Operator
88535
Relation between the distance from a point to the resolvent set of a self-adjoint operator and the norm of a related operator
54668
Proof for the completeness of eigenfunctions of a self-adjoint operator
144104
Show that a positive operator on a complex Hilbert space is self-adjoint
26249
Self adjoint operators and trace class property
22297
Normal operator $\Rightarrow$ S invariant implies $S^\perp$ invariant
146026
What is the norm of this bounded linear functional?
22689
Reference for trace/norm inequality
139272
On the norm of a quotient of a Banach space.
136635
Proving that the Fourier Basis is complete for C(R/$2*\pi$ , C) with $L^2$ norm
151046
Closure of the invertible operators on a Banach space
46265
Minimal polynomial of the operator $T:V\oplus W\to V\oplus W$
15035
An operator on the other side of the Schrödinger equation
128457
Show that $T$ is a compact operator
149664
Norm is sup of inner products (proof).
134939
Norm of element $\alpha$ equal to absolute norm of principal ideal $(\alpha)$
119684
Is a contraction idempotent operator self-adjoint?
73254
spectral radius in normed space is subadditive.