Congresses 25 Mathematics 13 Differential equations 12 Topology 12 Mathematical models 11 Differential equations, Partial 10 Number theory 10 Fluid dynamics 8 Geometry, Algebraic 8 Mathematical analysis 8 Numerical solutions 8 Stability 8 Algebra 7 Harmonic analysis 7 Numerical analysis 7 Quantum theory 7 Functional analysis 6 Functions of complex variables 6 Geometry, Differential 6 Representations of groups 6 Stochastic processes 6 Approximation theory 5 Differentiable dynamical systems 5 Machine theory 5 Martingales (Mathematics) 5 Spectral theory (Mathematics) 5 Algebraic topology 4 Boundary value problems 4 Control theory 4 Cryptography 4