Rational matrix functions associated with the Nevanlinna-Pick problem in the class <i>S</i> [<i>a, b</i>] and orthogonal on a compact interval

Abstract

We consider the interpolation Nevanlinna-Pick problem with infinitely many interpolation nodes in the class S[a, b] and rational matrix functions associated with this problem and orthogonal on the segment [a, b]. We obtain a criterion of complete indeterminacy of the Nevanlinna-Pick problem in terms of orthogonal rational matrix functions.