Operator theory 5 Algebraic topology 4 C*-algebras 4 Differentiable dynamical systems 4 Differential equations 4 Harmonic analysis 4 Operator algebras 4 more ... Banach spaces 3 Duality theory (Mathematics) 3 Holomorphic functions 3 Homology theory 3 Lie groups 3 Mathematics 3 Matrices 3 Representations of groups 3 Topological dynamics 3 Banach algebras 2 Differential equations, Nonlinear 2 Ergodic theory 2 Finite groups 2 Functional analysis 2 Geometry, Differential 2 Graph theory 2 Group rings 2 Homotopy theory 2 K-theory 2 Manifolds (Mathematics) 2 Metric spaces 2 Modules (Algebra) 2 Quantum theory 2 less ...