A Note On The Kadison-Singer Problem

Details A Note On The Kadison-Singer Problem A Note On The Kadison-Singer Problem

2007-08-17

arxiv.org/abs/0708.2366v1

Mathematics

Operator Algebras

Scientific paper

Let H be a separable Hilbert space with a fixed orthonormal basis (e_n), n>=1, and B(H) be the full von Neumann algebra of the bounded linear operators T: H -> H. Identifying l^\infty = C(\beta N) with the diagonal operators, we consider C(\beta N) as a subalgebra of B(H). For each t in \beta N, let [\delta_t] be the set of the states of B(H) that extend the Dirac measure \delta_t. Our main result shows that, for each t in \beta N, this set either lies in a finite dimensional subspace of B(H)* or else it must contain a homeomorphic copy of \beta N.

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