Differential operators 11 Linear operators 5 Differential equations 4 Differential geometry 4 Analytic spaces 3 Differential equations, Partial 3 Differential equations-- Analysis-- Mathematics 3 Geometry, Algebraic 3 Spectral theory (Mathematics) 3 Arithmetic functions 2 Boundary value problems 2 Differential equations, Hyperbolic 2 Differentialoperator 2 Fourier analysis 2 Functional analysis 2 Hilbert space 2 Lecture Notes in Mathematics 2 Partial differential operators 2 Pseudodifferential operators 2 p-adic numbers 2 p-adische Zahl 2 Asymptotic theory 1 Banach spaces 1 Calculus 1 Congresses 1 Data processing 1 Differentiable dynamical systems 1 Differentiable mappings 1 Differential equations, Linear 1 Differential operators.1 1