Singular perturbation problems 8 Combustion 6 Free boundary problem 4 Free-boundary problems 4 Inhomogeneous problems 4 Monotonicity formula 4 Singular perturbation 4 Singular perturbations 4 ANISOTROPIC ELEMENTS 3 DISCONTINUOUS GALERKIN 3 ELEMENTOS ANISOTROPICOS 3 ELEMENTOS FINITOS 3 FINITE ELEMENTS 3 GALERKIN DISCONTINUO 3 NORMAS CON PESOS 3 PROBLEMAS SINGULARMENTE PERTURBADOS 3 SINGULARLY PERTURBED PROBLEMS 3 WEIGHTED NORMS 3 Advection 2 Advection diffusion equation 2 Approximation spaces 2 Boundary value problems 2 Differential equations 2 Discontinuous Galerkin methods 2 Discontinuous galerkin 2 Elliptic problem 2 Error estimates 2 Following problem 2 Free boundaries 2 Free boundary 2