Mathematics 17 Mathematical analysis 15 Number theory 15 Topology 14 Geometry, Differential 12 Functional analysis 11 Algebra 10 Operator theory 9 Functions of complex variables-- Analysis-- Mathematics 8 Groups-- Algebra-- Mathematics 8 Number theory-- Algebra-- Mathematics 8 Algebra-- Mathematics 7 Approximation theory 7 Congresses 7 Differential equations-- Analysis-- Mathematics 7 Geometry, Algebraic 7 Mathematical Statistics 7 Probabilities 7 Calculus of variations 6 Functions of complex variables 6 Geometry 6 Analysis-- Mathematics 5 Calculus 5 Cryptography 5 Differential -- Integral geometry-- Mathematics 5 Game theory 5 Mathematical models 5 Measure theory 5 Representations of groups 5 Compact groups 4