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Fem-fenics

6 bytes added, 07:21, 16 September 2013
=== Mixed Formulation for Poisson Equation ===
In this example the poisson Poisson equation is solved with a '''mixed approach''': the stable FE space obtained using Brezzi-Douglas-Marini polynomial of order 1 and Dicontinuos element of order 0 is used.
<math>-\mathrm{div}\ ( \mathbf{\sigma} (x, y) ) ) = f (x, y) \qquad \mbox{ in } \Omega</math>
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