Completely semi--maps

Abstract

We introduce completely semi--maps on Hilbert C*-modules as a generalization of -maps. This class of maps provides examples of CP-extendable maps which are not CP-H-extendable, in Skeide-Sumesh's sense. Using the CP-extendability of completely semi--maps, we give a representation theorem, similar to Stinespring's representation theorem, for this class of maps which can be considered as strengthened and generalized form of Asadi's and Bhat-Ramesh-Sumesh's analogues of Stinespring representation theorem for -maps. We also define an order relation on the set of all completely semi--maps and establish a Radon-Nikodym type theorem for this class of maps in terms of their representations.

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