A constrained Nevanlinna-Pick interpolation problem for matrix-valued functions

Details A constrained Nevanlinna-Pick interpolation problem for matrix-valued functions A constrained Nevanlinna-Pick interpolation problem for matrix-valued functions

2008-09-13

arxiv.org/abs/0809.2345v1

Mathematics

Functional Analysis

29 pages

Scientific paper

Recent results of Davidson-Paulsen-Raghupathi-Singh give necessary and sufficient conditions for the existence of a solution to the Nevanlinna-Pick interpolation problem on the unit disk with the additional restriction that the interpolant should have the value of its derivative at the origin equal to zero. This concrete mild generalization of the classical problem is prototypical of a number of other generalized Nevanlinna-Pick interpolation problems which have appeared in the literature (for example, on a finitely-connected planar domain or on the polydisk). We extend the results of Davidson-Paulsen-Raghupathi-Singh to the setting where the interpolant is allowed to be matrix-valued and elaborate further on the analogy with the theory of Nevanlinna-Pick interpolation on a finitely-connected planar domain.

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