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math.OA2023
Partially Positive Semidefinite Maps on -Semigroupoids and Linearisations
Aurelian Gheondea, Bogdan Udrea
Motivated by Cuntz-Krieger-Toeplitz systems associated to undirected graphs and representations of groupoids, we obtain a generalisation of the Sz-Nagy's Dilation Theorem for opera…
math.OA2018
Some rigidity results for II factors arising from wreath products of property (T) groups
Ionut Chifan, Bogdan Teodor Udrea
We show that any infinite collection of icc, hyperbolic, property (T) groups satisfies the following von Neumann algebraic \emph{infinite product rigidity}…