Introduction Chapter ⅩⅦ. Second Order Elliptic Operators Summary 17.1. Interior Regularity and Local Existence Theorems 17.2. Unique Continuation Theorems 17.3. The Dirichlet Problem 17.4. The Hadamard Parametrix Construction 17.5. Asymptotic Properties of Eigenvalues and Eigenfunctions Notes Chapter ⅩⅧ. Pseudo-Differential Operators Summary 18.1. The Basic Calculus 18.2. Conormal Distributions 18.3. Totally Characteristic Operators 18.4. Gauss Transforms Revisited 18.5. The Weyl Calculus 18.6. Estimates of Pseudo-Differential Operators Notes Chapter ⅩⅨ. Elliptic Operators on a Compact Manifold Without Boundary 19.1. Abstract Fredholm Theory 19.2. The Index of Elliptic Operators 19.3. The Index Theorem in IRn 19.4. The Lefschetz Formula 19.5. Miscellaneous Remarks on Ellipticity Notes Chapter ⅩⅩ. Boundary Problems for Elliptic Differential Operators Summary 20.1. Elliptic Boundary Problems 20.2. Preliminaries on Ordinary Differential Operators 20.3. The Index for Elliptic Boundary Problems 20.4. Non-Elliptic Boundary Problems Notes Chapter ⅩⅩⅠ. Symplectic Geometry Summary 21.1. The Basic Structue 21.2. Submanifolds of a Sympletic Manifold 21.3. Normal Forms of Functions 21.4. Folds and Glancing Hypersufaces 21.5. Symplectic Equivalence of Quadratic Forms 21.6. The Lagrangian Grassmannian Notes Chapter ⅩⅩⅡ. Some Classes of (Micro-)hypoelliptic Operators Chapter ⅩⅩⅢ. The Strictly hyperbolic Cauchy Problem Chapter ⅩⅩⅣ. The Mixed Dirichlet-Cauchy Prblem for Second Order Operators Appendix B. Some Spaces of Distributions Appendix C. Some Tools from Differential Geometry Bibliography Index Index of Notation