Spectral decomposition.- Two-space scattering theory.- Scattering theory for N-body systems.- Exact parametrices.- Quasibound states and the finiteness of the discrete spectrum.- Boundary values of the resolvent. General single-channel case.- Boundary values of the resolvent. The general case.- Non-dilation-analytic potentials.- Instability of quasibound-state and embedded eigenvalues.