Convection-diffusion Error analysis 6 Asymptotic behaviour 4 Finite element method 4 Finite elements 4 Graded meshes 4 Nonlocal diffusion 4 Problem solving 4 Anisotropic elements 2 Anisotropy 2 Approximation theory 2 Convection diffusion 2 Differential equations 2 Diffusion in liquids 2 Error estimates 2 Estimation 2 Finite Element 2 Galerkin approximations 2 Galerkin methods 2 Heat convection 2 Interpolation 2 Least squares approximations 2 Linear equations 2 Mixed method 2 Mixed methods 2 Moving least square 2 Moving least square approximation 2 Numerical methods 2 Partial differential equations 2 Perturbation parameters 2