68 citations · 81 across the 10 of their papers we have counts for
17 papers · 1 filter
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…
The Lattice of C*-covers of an operator algebra
Adam Humeniuk, Christopher Ramsey
In this paper it is shown that the lattice of C*-covers of an operator algebra does not contain enough information to distinguish operator algebras up to completely isometric isomo…
Symbolic Substitutions, Bratteli Diagrams and Operator Algebras
Dylan Gawlak, Christopher Ramsey
In this paper we look at symbolic substitutions and their relationship to Bratteli diagrams and their associated operator algebras. In particular, we consider the equivalence relat…
The isomorphism problem for tensor algebras of multivariable dynamical systems
Elias Katsoulis, Christopher Ramsey
We resolve the isomorphism problem for tensor algebras of unital multivariable dynamical systems. Specifically we show that unitary equivalence after a conjugation for multivariabl…
The hyperrigidity of tensor algebras of C-correspondences
Elias Katsoulis, Christopher Ramsey
Given a C-correspondence , we give necessary and sufficient conditions for the tensor algebra to be hyperrigid. In the case where is coming from a topol…
The non-selfadjoint approach to the Hao-Ng isomorphism
Elias Katsoulis, Christopher Ramsey
In an earlier work, the authors proposed a non-selfadjoint approach to the Hao-Ng isomorphism problem for the full crossed product, depending on the validity of two conjectures sta…