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math.OA2026
Finite-dimensional approximations for C*-algebras of product systems
Evgenios T. A. Kakariadis, Ioannis Apollon Paraskevas
We study C*-algebras generated by representations of product systems over unital subsemigroups of amenable discrete groups. In the first part, we show that exactness of the generat…
math.OA2026
Operator systems and positive extensions over discrete groups
Evgenios T. A. Kakariadis, Malte Leimbach, Ivan G. Todorov +1
The extension problem asks whether positive semi-definite functions on a symmetric unital subset of a discrete group can be extended to positive semi-definite functions on the whol…