Functional analysis 259 Mathematics 138 Differential equations, Partial 54 Operator theory 43 Global analysis (Mathematics) 27 Mathematical optimization 27 Nonlinear functional analysis 24 Mathematical physics 22 Distribution (Probability theory) 21 Fourier analysis 20 Theory of distributions (Functional analysis) 18 Functions of complex variables 16 Algebra 15 Differential equations 13 Harmonic analysis 13 Integral transforms 10 Engineering mathematics 9 Number theory 9 Differentiable dynamical systems 8 Functions, Special 8 Mathematical models 8 Measure theory 8 Numerical analysis 8 Topology 8 Engineering 7 Global analysis 7 Integral equations 7 Potential theory (Mathematics) 7 Topological groups 7 Calculus of variations 6