Finite element approximations 8 Finite element method 8 Finite elements 4 Fractional Laplacian 4 Graded meshes 4 Laplace transforms 4 Numerical experiments 4 A-priori estimates 2 Continuous approximations 2 Eigenvalue problem 2 Eigenvalues and eigenfunctions 2 Error analysis 2 Finding solutions 2 Finite Element 2 Flow of fluids 2 Integrodifferential equations 2 Laplace equation 2 Linear equations 2 Linear finite elements 2 Mathematical models 2 Mixed finite element approximation 2 Mixed finite elements 2 Navier Stokes equations 2 Nonlinear equations 2 Numerical methods 2 Optimal accuracy 2 Optimal error estimate 2 Optimal order of convergence 2 Piece-wise 2 Poisson equation 2