The rate of convergence for the method of alternating projections. II
[For Part I see \textit{F. Deutsch}, Parametric optimization and approximation, Conf. Oberwolfach 1983, ISNM 72, 96-107 (1985; Zbl 0575.65049).] The authors give a very useful, easily computable error bound for the method of alternating projections. They also show that any error bound, which only depends on the angles between the various subspaces involved, can never be sharp. A counter-example to a conjecture of \textit{S. Kayalar} and \textit{H. L. Weinert} [Math. Control Signals Syst. 1, No. 1, 43-59 (1988; Zbl 0673.65036)] is also given.
scientific article; zbMATH DE number 1005662