Congresses 21 Set theory 7 Programming (Mathematics) 5 Combinatorial analysis 3 Crystals 3 Defects 3 Differential equations, Partial 3 Topology 3 Banach spaces 2 Cell membranes 2 Civil law 2 Comparative law 2 Computer networks 2 Constructive mathematics 2 Data processing 2 Descriptive set theory 2 Duality theory (Mathematics) 2 Electronic data processing 2 Electronic digital computers 2 Functional analysis 2 History 2 Holomorphic functions 2 Mathematical models 2 Mathematical physics 2 Mathematics 2 Nonstandard mathematical analysis 2 Philosophy 2 Physics 2 Probability Theory 2 Quantum theory 2