On the {Bessmertnyĭ} Class of Homogeneous Positive Holomorphic Functions on a Product of Matrix Halfplanes

Details On the {Bessmertnyĭ} Class of Homogeneous Positive Holomorphic Functions on a Product of Matrix Halfplanes On the {Bessmertnyĭ} Class of Homogeneous Positive Holomorphic Functions on a Product of Matrix Halfplanes

2004-12-08

arxiv.org/abs/math/0412164v1

Mathematics

Functional Analysis

Scientific paper

We generalize our earlier results from \cite{K} on the Bessmertny\u{\i} class of operator-valued functions holomorphic in the open right poly-halfplane which admit representation as a Schur complement of a block of a linear homogeneous operator-valued function with positive semidefinite operator coefficients, to the case of a product of open right matrix halfplanes. Several equivalent characterizations of this generalized Bessmertny\u{\i} class are presented. In particular, its intimate connection with the Agler--Schur class of holomorphic contractive operator-valued functions on the product of matrix unit disks is established.

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