Anisotropic elements Anisotropy 4 Error analysis 4 Estimation 4 Interpolation 4 Lagrange interpolation 4 Maximum angle condition 4 Weighted norms 4 Angle measurement 2 Average interpolation 2 Convection diffusion 2 Convection-diffusion 2 Diffusion in liquids 2 Finite Element 2 Finite element method 2 Finite elements 2 Heat convection 2 Isoparametric finite elements 2 Mixed method 2 Mixed methods 2 Partial differential equations 2 Polynomials 2 Quadrilateral elements 2 Stokes equations 2 mathematical method 2