Abstract
If M is a von Neumann algebra in H , each faithful weight ψ on M′ defines an operator-valued weight ψ −1 of L(H) on M. For each weight ϑ on M the positive unbounded operator dϑ dψ = ϑ ∘ ψ −1 satisfies all the usual properties of a Radon-Nikodym derivative.
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