2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39091The lattice method for the calculation of weak decay amplitudes of heavy quark systems is introduced. Results for leptonic and semi-leptonic decays of heavy mesons and $B-\bar{B}$ mixing are reviewed.12 pages, LaTeX + cimento.cls (provided), axodraw, 2 postscript files, lecture presented at International School of Physics, "Enrico Fermi", Varenna, Italy, 8-18 July 1997High Energy Physics - LatticeHigh Energy Physics - Phenomenologytext