Mathematics – Operator Algebras
Scientific paper
2004-04-30
In M. Sch\"urmann and U. Franz, editors,QP-PQ: Quantum Probability and White Noise Analysis XVIII, pages 504--517. World Sci
Mathematics
Operator Algebras
Scientific paper
We describe three methods to determine the structure of (sufficiently continuous) representations of the algebra B^a(E) of all adjointable operators on a Hilbert B-module E by operators on a Hilbert C-module. While the last and latest proof is simple and direct and new even for normal representations of B(H) (H some Hilbert space), the other ones are direct generalizations of the representation theory of B(H) (based on Arveson's and on Bhat's approaches to product systems of Hilbert spaces) and depend on technical conditions (for instance, existence of a unit vector or restriction to von Neumann algebras and von Neumann modules). We explain why for certain problems the more specific information available in the older approaches is more useful for the solution of the problem.
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