Type: Article
Publication Date: 2010-04-25
Citations: 116
DOI: https://doi.org/10.4007/annals.2010.171.1931
The results of Denisov-Rakhmanov, Szegő-Shohat-Nevai, and Killip-Simon are extended from asymptotically constant orthogonal polynomials on the real line (OPRL) and unit circle (OPUC) to asymptotically periodic OPRL and OPUC.The key tool is a characterization of the isospectral torus that is well adapted to the study of perturbations.