Approximation theory 5 Differential equations, Partial 5 Potential theory (Mathematics) 5 Categories (Mathematics) 4 Functions of complex variables 4 Geometry, Algebraic 4 Geometry, Differential 4 Group theory 4 Algebraic fields 3 Banach spaces 3 Differential topology 3 Functional analysis 3 Lie algebras 3 Mathematical analysis 3 Modules (Algebra) 3 Numerical solutions 3 Philosophy 3 Probabilities 3 Representations of groups 3 Spline theory 3 Analytic functions 2 Automatic control 2 Boundary value problems 2 Cobordism theory 2 Commutative rings 2 Complex manifolds 2 Crystallography 2 Data processing 2 Design and construction 2 Differential equations, Nonlinear 2