The Rate of Convergence for the Method of Alternating Projections, II

AbstractThe purpose of the paper is threefold:(1) To develop a useful error bound for the method of alternating projections which is relatively easy to compute and remember;(2) To exhibit a counterexample to a conjecture of Kayalar and Weinert;(3) To show that (in the case of at least three subspaces) any error bound which only depends on the angles between the various subspaces involved canneverbe sharp