Differential equations, Partial 13 Congresses 10 Algebra 9 Data processing 7 Differential equations 7 Rings (Algebra) 7 Control theory 5 Boundary element methods 4 Group theory 4 Mathematical optimization 4 Mathematics 4 Nonlinear functional analysis 4 Abelian groups 3 Mathematical models 3 Modules (Algebra) 3 Stochastic processes 3 Asymptotic expansions 2 Averaging method (Differential equations) 2 Banach spaces 2 Convex functions 2 Differential equations, Linear 2 Fourier analysis 2 Functional analysis 2 Group rings 2 Inverse problems (Differential equations) 2 Mathematical analysis 2 Nonlinear systems 2 Numerical solutions 2 Research 2 Stochastic partial differential equations 2