Number theory 14 Number Theory 13 Special Functions 8 Special functions 8 Algebraic Geometry 6 Algebraic geometry 6 Algebra 5 more ... Combinatorics 5 Partial Differential Equations 5 Partial differential equations 5 Functions of complex variables 4 Topology 4 Functional Analysis 3 Functional analysis 3 Functions of a Complex Variable 3 Approximation theory 2 Approximations and Expansions 2 Differential equations 2 Dynamical Systems and Ergodic Theory 2 Dynamics 2 Ergodic theory 2 Fourier Analysis 2 Fourier analysis 2 Lie groups 2 Ordinary Differential Equations 2 Sequences (Mathematics) 2 Sequences, Series, Summability 2 Several Complex Variables and Analytic Spaces 2 Topological Groups, Lie Groups 2 Topological groups 2 less ...