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Kadison-Singer

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The Kadison-Singer Problem is an old question from von Neumann algebra theory, whose roots lie in Dirac’s writings on quantum mechanics. Its classical expression is as follows: Consider the algebra \(B\) of all bounded operators on a separable Hilbert space, and the maximal abelian subalgebra \(D\) of all diagonal operators (relative to some fixed orthonormal […]

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