Konrad Schmüdgen

collaborators

4 papers

math.FA2026

Domain Characterizations of Strong Commutativity\break of Unbounded Self-Adjoint Operators

Konrad Schmüdgen

Let $A$ and $B$ be unbounded self-adjoint operators on a Hilbert space. Suppose that there exists a dense linear subspace $D \subseteq D (A B) \cap D (B A)$ such that $A B x = B A x$ for $x \i…

math.FA2026

Antilinar Normal Operators on Hilbert Space

Konrad SchmÃ¼dgen

An operator $A$ on a complex Hilbert space $\Hh$ is called antilinear if $A (x + y) = A x + A y$ and $A(Î»x)=\ovÎ» Ax$ for $x,y\in \cD(A)$ and $Î»\in \dC$. We investigate some classes of de…

math.FA2025

On $C$ -Symmetric and $C$ -Self-adjoint Unbounded Operators on Hilbert Space

Yury Arlinskii, Konrad SchmÃ¼dgen

Let $C$ be a conjugation on a Hilbert space $H$ . A densely defined linear operator $A$ on $H$ is called $C$ -symmetric if $C A C \subseteq A^{*}$ and $C$ -self-adjoint…

math.FA2025

$C$ -self-adjoint contractive extensions of $C$ -symmetric non-densely defined contractions

Yury Arlinskii, Konrad SchmÃ¼dgen

Given a conjugation (involution) $C$ on a Hilbert space, $C$ -self-adjoint contractive extensions of a non-densely defined $C$ -symmetric contraction are studied and parameterization…

Domain Characterizations of Strong Commutativity\break of Unbounded Self-Adjoint Operators

Antilinar Normal Operators on Hilbert Space

On C-Symmetric and C-Self-adjoint Unbounded Operators on Hilbert Space

C-self-adjoint contractive extensions of C-symmetric non-densely defined contractions

On $C$ -Symmetric and $C$ -Self-adjoint Unbounded Operators on Hilbert Space

$C$ -self-adjoint contractive extensions of $C$ -symmetric non-densely defined contractions