Bebe Prunaru

activity

20052013

most citedTsirelson's problem and purely atomic von Neumann algebras

1 citations · 1 across the 6 of their papers we have counts for

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5 papers · 1 filter

math.OA2013

On the Choi-Effros multiplication

Bebe Prunaru

A short proof is given for the well-known Choi-Effros theorem on the structure of ranges of completely positive projections.

math.OA2011★ 1 cited

Tsirelson's problem and purely atomic von Neumann algebras

Bebe Prunaru

It is shown that if a bipartite behavior admits a field representation in which Alice (or Bob's) observable algebra generates a purely atomic von Neumann algebra then it is non-rel…

math.OA2011

Lifting fixed points of completely positive semigroups

Bebe Prunaru

Let ${ϕ_{s}}_{s \in S}$ be a commutative semigroup of completely positive, contractive, and weak*-continuous linear maps acting on a von Neumann algebra $N$ . Assume there exists a s…

math.OA2005

Some Exact Sequences for Toeplitz Algebras of Spherical Isometries

Bebe Prunaru

A family ${T_{j}}_{j \in J}$ of commuting Hilbert space operators is said to be a spherical isometry if $\sum_{j \in J} T_{j}^{*} T_{j} = 1$ in the weak operator topology. We show that every c…

math.OA2005

Amenability, completely bounded projections, dynamical systems and smooth orbits

Daniel Beltiţă, Bebe Prunaru

We describe a general method to construct completely bounded idempotent mappings on operator spaces, starting from amenable semigroups of completely bounded mappings. We then explo…