Differential equations Asymptotic theory 3 Banach spaces 1 Continuous groups 1 Data processing 1 Differentiable dynamical systems 1 Differential equations, Partial 1 Inverse problems (Differential equations) 1 Numerical solutions 1 Perturbation (Mathematics) 1 Riemannian manifolds 1 Singular perturbations (Mathematics) 1 Spectral geometry 1