On associated polynomials and decay rates for birth–death processes

We consider sequences of orthogonal polynomials and pursue the question of how (partial) knowledge of the orthogonalizing measure for the associated polynomials can lead to information about the orthogonalizing measure for the original polynomials. In particular, we relate the supports of the two measures, and their moments. As an application, we analyze the relation between two decay rates connected with a birth–death process.  2003 Elsevier Science (USA). All rights reserved