Abstract

Let J be an m × m signature matrix (i.e. J ∗ = J and J 2 = I m ) and let D : = { z ∈ C : | z | < 1 } . Denote P J ( D ) the class of all J -Potapov functions in D , i.e. the set of all meromorphic m × m matrix-valued functions f in D with J -contractive values at all points of D at which f is holomorphic. Further, denote P J , 0 ( D ) the subclass of all f ∈ P J ( D ) which are holomorphic at the origin. Let f ∈ P J , 0 ( D ) , and let f ( w ) = ∑ j = 0 ∞ A j w j be the Taylor series representation of f in some neighborhood of 0 . Then it was proved in [B. Fritzsche, B. Kirstein, U. Raabe, On the structure of J -Potapov sequences, Linear Algebra Appl., in press] that for each n ∈ N the matrix A n can be described by its position in a matrix ball depending on the sequence ( A j ) j = 0 n - 1 . The J -Potapov function f is called J -central if there exists some k ∈ N such that for each integer j ⩾ k the matrix A j coincides with the center of the corresponding matrix ball. In this paper, we derive left and right quotient representations of matrix polynomials for J -central J -Potapov functions in D . Moreover, we obtain recurrent formulas for the matrix polynomials involved in these quotient representations.

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