Functions of complex variables Mathematics 61 Mathematical analysis 43 Differential equations, Partial 33 Operator theory 18 Functional analysis 16 Global differential geometry 8 Differentiable dynamical systems 7 Global analysis (Mathematics) 7 Number theory 7 Differential equations 6 Engineering mathematics 6 Fourier analysis 6 Functions, Special 6 Geometric function theory 6 Mathematical physics 6 Numerical analysis 6 Control theory 5 Feedback control systems 5 Functions of several complex variables 5 Geometry, algebraic 5 Harmonic analysis 5 Potential theory (Mathematics) 5 Sequences (Mathematics) 5 Vector analysis 5 Algebra 4 Calculus 4 Functional equations 4 Topological groups 4 Analytic functions 3