3 papers
math.SP2025
Positivity properties of the Dirichlet-to-Neumann operator on graphs
Daniel Daners, Jochen Glück, James B. Kennedy
We explore positivity properties of the semigroup generated by the negative of the Dirichlet-to-Neumann operator with real potential , defined on a subset of the vertices of a…
math.FA2025
Automatic time continuity of positive matrix and operator semigroups
Jochen Glück
We consider a matrix semigroup without assuming any measurability properties and show that, if is bounded close to and $T(t) \ge…
math.FA2024
Uniform ergodic theorems for semigroup representations
Jochen Glück, Patrick Hermle, Henrik Kreidler
We consider a bounded representation of a commutative semigroup on a Banach space and analyse the relation between three concepts: (i) properties of the unitary spectrum of…