Rational inner functions in the Schur-Agler class of the polydisk

Details Rational inner functions in the Schur-Agler class of the polydisk Rational inner functions in the Schur-Agler class of the polydisk

2010-05-28

arxiv.org/abs/1005.5409v1

Mathematics

Functional Analysis

14 pages

Scientific paper

Every two variable rational inner function on the bidisk has a special representation called a transfer function realization. It is well known and related to important ideas in operator theory that this does not extend to three or more variables on the polydisk. We study the class of rational inner functions on the polydisk which do possess a transfer function realization (the Schur-Agler class) and investigate minimality in their representations. Schur-Agler class rational inner functions in three or more variables cannot be represented in a way that is as minimal as two variables might suggest.

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