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→Mixed Formulation for Poisson Equation
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=== Mixed Formulation for Poisson Equation === | === Mixed Formulation for Poisson Equation === | ||
In this example the | In this example the 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> | <math>-\mathrm{div}\ ( \mathbf{\sigma} (x, y) ) ) = f (x, y) \qquad \mbox{ in } \Omega</math> | ||