Kernel decompositions for Schur functions on the polydisk

Details Kernel decompositions for Schur functions on the polydisk Kernel decompositions for Schur functions on the polydisk

2009-09-09

arxiv.org/abs/0909.1828v1

Mathematics

Complex Variables

18 pages

Scientific paper

A certain kernel (sometimes called the Pick kernel) associated to Schur functions on the disk is always positive semi-definite. A generalization of this fact is well-known for Schur functions on the polydisk. In this article, we show that the Pick kernel on the polydisk has a great deal of structure beyond being positive semi-definite. It can always be split into two kernels possessing certain shift invariance properties.

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