Konrad Schmüdgen

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math.FA2025

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

Yury Arlinskii, Konrad Schmüdgen

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…

math.FA2025

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

Yury Arlinskii, Konrad Schmüdgen

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.FA2024

Moment property and positivity for some algebras of fractions

Claus Scheiderer, Konrad Schmüdgen

T. M. Bisgaard proved that the $*$ -algebra $C [z, z, 1/ z z]$ has the moment property, that is, each positive linear functional on this $*$ -algebra is a mome…

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

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

Moment property and positivity for some algebras of fractions

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

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