Elliptic operators Spectral theory (Mathematics) 3 Diffusion processes 2 Eigenvalues 2 Manifolds (Mathematics) 2 Asymptotic expansions 1 Boundary value problems 1 Differential equations, Elliptic 1 Differential equations, Stochastic 1 Fiberings (Mathematics) 1 Geometry, Differential 1 Global analysis (Mathematics) 1 Index theorems 1 Initial value problems 1 Lie groups 1 Numerical solutions 1 Singularities (Mathematics) 1