3 papers
math.FA2026
Banach algebra crossed products by inverse semigroup actions
K. Bardadyn, B. K. Kwaśniewski
We give a self-contained and simplified presentation of the theory of covariant representations for inverse semigroup actions on Banach algebras, which was recently introduced in t…
math.FA2024
Banach algebras associated to twisted étale groupoids: simplicity and pure infiniteness
Krzysztof Bardadyn, Bartosz Kwaśniewski, Andrew McKee
We define reduced and essential Banach algebras associated to a twisted étale (not necessarily Hausdorff) groupoid and extend some fundamental results f…
math.FA2019
Spectrum of weighted isometries: C*-algebras, transfer operators and topological pressure
K. Bardadyn, B. Kwaśniewski
We study the spectrum of operators on a Hilbert space where is an isometry and belongs to a commutative -subalgebra such t…