1 citations · 2 across the 5 of their papers we have counts for
6 papers
-Positivity Preservers and their Generators
Philipp J. di Dio, Konrad Schmüdgen
We study -positivity preservers with given closed , i.e., linear maps such that $T\mathrm{Pos}(…
A general fibre theorem for moment problems and some applications
Konrad Schmüdgen
The fibre theorem \cite{schm2003} for the moment problem on closed semi-algebraic subsets of is generalized to finitely generated real unital algebras. As an application two…
A Resolvent Approach to the Real Quantum Plane
Vasyl Ostrovskyi, Konrad Schmüdgen
Let be a complex number of modulus one. This paper deals with the operator relation for self-adjoint operators and on a Hilbert space. Two classes of…
A Strict Positivstellensatz for Enveloping Algebras
Konrad Schmuedgen
Let G be a connected and simply connected real Lie group with Lie algebra g. Semialgebraic subsets of the unitary dual of G are defined and a strict Positivstellensatz for positive…
A Strict Positivstellensatz for the Weyl Algebra
Konrad Schmuedgen
Let be an element of the Weyl algebra which is given by a strictly positive operator in the Schr"odinger representation. It is shown that, under some conditions, there e…
Examples of twisted cyclic cocycles from covariant differential calculi
Konrad Schmuedgen, Elmar Wagner
For two covariant differential *-calculi, the twisted cyclic cocycle associated with the volume form is represented in terms of commutators [F,ρ(x)] for some self-adjoint operator…