Hilbert space Linear operators 4 Operator theory 3 Banach spaces 2 Differential equations 2 Differential equations, Partial 2 Mathematical statistics 2 more ... Measure theory 2 Probabilities 2 Problems, exercises, etc 2 Quantum theory 2 Banach algebras 1 Boundary value problems 1 Calculus of variations 1 Functions of several complex variables 1 Hazards regression model 1 Integral equations 1 Integral representations 1 Integrals, Generalized 1 Invariant subspaces 1 Kernel functions 1 Lattice theory 1 Mathematical optimization 1 Mathematical physics 1 Numerical solutions 1 Operator algebras 1 Perturbation (Quantum dynamics) 1 Quantum field theory 1 Scattering (Mathematics) 1 Spectral theory (Mathematics) 1 less ...