1. The Euler–Lagrange Theory for Schur's algorithm: Wall pairs Author Khrushchev, S. Subjects *INFINITE processes, *MATHEMATICAL analysis, *ALGEBRA, *ALGORITHMS Abstract Abstract: This paper develops a techniques of Wall pairs for the study of periodic exposed quadratic irrationalities in the unit ball of the Hardy algebra. [Copyright &y& Elsevier] Published 2006 Full Text View/download PDF