Authors: Jan Hamhalter
Publish Date: 2009/07/30
Volume: 49, Issue: 12, Pages: 3139-3145
Abstract
Recent results on absolute continuity of Banach space valued operators and convergence theorems on operator algebras are deepened and summarized It is shown that absolute continuity of an operator T on a von Neumann algebra M with respect to a positive normal functional ψ on M is not implied by the fact that the null projections of ψ are the null projections of T However it is proved that the implication above is true whenever M is finite or T is weakcontinuous Further it is shown that the absolute value preserves the VitaliHahnSaks property if and only if the underlying algebra is finite This result improves classical results on weak compactness of sets of noncommutative measures
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