Convexity analysis and matrix-valued Schur class over finitely connected planar domains

Details Convexity analysis and matrix-valued Schur class over finitely connected planar domains Convexity analysis and matrix-valued Schur class over finitely connected planar domains

2011-09-17

arxiv.org/abs/1109.3793v1

Mathematics

Functional Analysis

33 pages

Scientific paper

We identify the set of extreme points and apply Choquet theory to a normalized matrix-measure ball subject to finitely many linear side constraints. As an application we obtain integral representation formulas for the Herglotz class of matrix-valued functions on a finitely-connected planar domain and associated continuous Agler decompositions for the matrix-valued Schur class over the domain. The results give some additional insight into the negative answer to the spectral set problem over such domains recently obtained by Agler-Harland-Raphael and Dritschel-McCullough.

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