Mathematical analysis 15 Mathematics 14 Number theory 14 Topology 14 Geometry, Differential 12 Functional analysis 11 Algebra 10 Approximation theory 7 Geometry, Algebraic 7 Mathematical Statistics 7 Probabilities 7 Calculus of variations 6 Congresses 6 Functions of complex variables 6 Geometry 6 Operator theory 6 Calculus 5 Cryptography 5 Game theory 5 Mathematical models 5 Measure theory 5 Representations of groups 5 Compact groups 4 Control theory 4 Differential equations, Partial 4 Differential geometry 4 Functional Analysis 4 Functional analysis -- Instructional exposition (textbooks, tutorial papers, etc.) 4 Mechanics 4 Algebras, Linear 3