CONTENTS Introduction ................................................................................................................... 5 1. Preliminaries............................................................................................................. 9 2. Tie Farey arcs............................................................................................................ 12 3. The contribution of the major and minor arcs..................................................... 13 4. Weyl's Lemma.......................................................................................................... 16 5. The singular integral................................................................................................ 23 6. The singular series.................................................................................................. 28 7. The asymptotic formula ......................................................................................... 37 8. Estimates for $\tilde{g}(k)$..................................................................................... 40 Bibliography................................................................................................................... 55