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Among the more common numeric methods of solution for partial differential equations (PDE) we have the finite differences method and the finite elements method that approach the real solution through an effcient and accurate algorithm of convergence. Many of the physical phenomena that can be studied by means of these techniques obey their behavior to the EDP' s of Laplace and Poisson, on whom different initial and/or boundary conditions can be restricted, to limit the solutions of the equation. This work shows the application of the finite difference method with a simple handling of the domain discretization and a simple handling of the boundary conditions on several domains, mainly with the domain with shape of ring or "donut", showing interesting results when selecting border conditions of the Dirichlet kind.

Discretización en diferencias finitas de la ecuación de Laplace y Poisson. Aplicación a un anillo circular (dona)