Analysis of Approximation Methods for Differential and Integral Equations I: Presentation of Numerical Methods 1. Finite Difference Methods for Boundary Value Problems 2. Projection Methods for Variational Equations 3. Approximation Methods for Integral Equations of the Second Kind 4. Approximation Methods for Initial Value Problems in Partial Differential Equations 74 II: Convergence Theory 5. The Concepts of Discrete Convergence and Discrete Approximations 6. Discrete Convergence of Mappings and Solutions of Equations 7. Compactness Criteria for Discrete Convergence III: Convergence Analysis for Approximate Solutions of Boundary Value Problems and Integral Equations 8. Convergence of Finite Difference Methods for Boundary Value Problems 9. Biconvergence for Projection Methods Via Variational Principles 10. Convergence of Perturbations of Integral Equations of The Second Kind IV: Inverse Stability Consistency and Convergence for Initial Value Problems in Partial Differential Equations 11. Inverse Stability and Convergence for General Discrete Time Approximations of Linear and Nonlinear Initial Value Problems 12. Special Criteria for Inverse Stability 13. Convergence Analysis of Special Methods Glossary of Symbols. This book is primarily based on the research done by the Numerical Analysis Group at the Goethe Universitat in Frankfurt Main and on material presented in several graduate courses by the author between 1977 and 1981. It is hoped that the text will be useful for graduate students and for scientists interested in studying a fundamental theoretical analysis of numerical methods along with its application to the most diverse classes of differential and integral equations. The text treats numerous methods for approximating solutions of three classes of problems: (elliptic) boundary value problems (hyperbolic and parabolic) initial value problems in partial differential equations and integral equations of the second kind. The aim is to develop a unifying convergence theory and thereby prove the convergence of as well as provide error estimates for the approximations generated by specific numerical methods. The schemes for numerically solving boundary value problems are additionally divided into the two categories of finite­ difference methods and of projection methods for approximating their variational formulations.