Published November 2003 | Submitted
Journal Article Open

Sum Rules and the Szegő Condition for Orthogonal Polynomials on the Real Line

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Abstract

We study the Case sum rules, especially C_0, for general Jacobi matrices. We establish situations where the sum rule is valid. Applications include an extension of Shohat's theorem to cases with an infinite point spectrum and a proof that if lim n(a_n−1)=α and lim nb_n=β exist and 2α<|β|, then the Szegő condition fails.

Additional Information

© 2003 Springer-Verlag Berlin Heidelberg. Received: 27 January 2003; Accepted: 25 March 2003; First Online: 10 October 2003. Supported in part by NSF grant DMS-9707661.

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