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Search: MSC category 47A20 ( Dilations, extensions, compressions )

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1. CMB 2010 (vol 53 pp. 550)

Shalit, Orr Moshe
Representing a Product System Representation as a Contractive Semigroup and Applications to Regular Isometric Dilations
In this paper we propose a new technical tool for analyzing representations of Hilbert $C^*$-product systems. Using this tool, we give a new proof that every doubly commuting representation over $\mathbb{N}^k$ has a regular isometric dilation, and we also prove sufficient conditions for the existence of a regular isometric dilation of representations over more general subsemigroups of $\mathbb R_{+}^k$.

Categories:47A20, 46L08

2. CMB 2003 (vol 46 pp. 59)

Constantinescu, T.; Johnson, J. L.
A Note on Noncommutative Interpolation
In this paper we formulate and solve Nevanlinna-Pick and Carath\'eodory type problems for tensor algebras with data given on the $N$-dimensional operator unit ball of a Hilbert space. We develop an approach based on the displacement structure theory.

Categories:47A57, 47A20

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