Congresses 23 Mathematical analysis 13 Functional analysis 12 Rings (Algebra) 12 Numerical solutions 11 Differential equations 10 Algebras, Linear 9 Integral equations 8 Topology 8 Boundary value problems 7 Differential equations, Partial 7 Functions of complex variables 7 Homology theory 7 Banach algebras 6 Banach spaces 6 Data processing 6 Geometry, Differential 6 Measure theory 6 Numerical analysis 6 Set theory 6 Algebra 5 Commutative rings 5 Geometry, Algebraic 5 Geometry, Projective 5 Mathematics 5 Algebraic fields 4 Algebraic number theory 4 Approximation theory 4 Calculus of variations 4 Categories (Mathematics) 4