Published: January 1979
- Asymptotic Definitions and Properties. Functions with Singularities on Subsets of Lower Dimension (Boundary Layers). Matching Relations and Composite Expansions. Heuristic Analysis of Singular Perturbations. Linear Problems. Heuristic Analysis Continued. Non-linear Problems. Foundations for a Rigorous Theory of Singular Perturbations. Elliptic Singular Perturbations. Bibliography.