"Version: 20200801"--Title page verso.Includes bibliographical references.1. Preliminaries -- 1.1. Functionals and classical mechanics -- 1.2. The operator formulation of quantum mechanics -- 1.3. Operator identities -- 1.4. Grassmann variables -- 1.5. Gaussian integrals -- 1.6. Poisson resummation2. The quantum mechanical path integral -- 2.1. The infinitesimal transition element -- 2.2. The b…