3 papers
math.OA2026
Rigidity for Isomorphisms between Operator Algebras with Commutative Diagonals
Elias G. Katsoulis, Feifei Miao, Wenming Wu +1
We show that two families of operator algebras, the CSL algebras of multiplicity free CSLs and the semicrossed products of commutative C-algebras, demonstrate a strong form of…
math.OA2025
Nondegenerate actions on Hilbert C*-modules
Elias Katsoulis, Christopher Ramsey
Let X be a (right) Hilbert C*-module and let B be a C*-algebra acting on X from the left via adjointable operators. In this note we establish the equivalence of two notions of nond…
math.OA2025
Crossed products and C*-covers of semi-Dirichlet operator algebras
Adam Humeniuk, Elias G. Katsoulis, Christopher Ramsey
In this paper, we show that the semi-Dirichlet C*-covers of a semi-Dirichlet operator algebra form a complete lattice, establishing that there is a maximal semi-Dirichlet C*-cover.…