65N06 Finite difference methods 
65N12 Stability and convergence of numerical methods 
65N15 Error bounds 
65N21 Inverse problems 
65N22 Solution of discretized equations [See also 65Fxx, 65Hxx]
65N25 Eigenvalue problems 
65N30 Finite elements, Rayleigh-Ritz and Galerkin methods, finite methods 
65N35 Spectral, collocation and related methods 
65N38 Boundary element methods 
65N40 Method of lines 
65N45 Method of contraction of the boundary 
65N50 Mesh generation and refinement 
65N55 Multigrid methods; domain decomposition 
65N99 None of the above, but in this section