Mathematics 17 Algebra-- Mathematics 13 Algebra 12 Operational calculus-- Functional analysis-- Mathematics 10 Calculus 9 Mathematical analysis 7 Number theory-- Algebra-- Mathematics 6 Biography-Mathematicians 5 Civil engineering 4 Engineering 4 Analysis-- Mathematics 3 Functions of complex variables 3 Topology of spaces-- Manifold topology-- Metric topology 3 Algebraic geometry 2 Biogeography 2 Complex analysis 2 Cryptography 2 Differentiable manifolds 2 Differential -- Integral geometry-- Mathematics 2 Electronic commerce 2 Elementary Japanese 2 Elliptic functions-- Polyhedral functions 2 Functions of complex variables-- Analysis-- Mathematics 2 Functions of real variables-- Analysis-- Mathematics 2 Geometry 2 Geometry, Differential 2 Geometry-- Mathematics 2 History 2 Juvenile wood 2 Linear, multilinear, multidimensional, vector algebras-- Mathematics 2