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1 byte added ,  19 July 2012
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<math>  -\mathrm{div}\ ( \varepsilon \nabla u(x, y) - \nabla \varphi(x,y)\ u(x, y) ) ) + u(x, y) = 1 </math>
<math>  -\mathrm{div}\ ( \varepsilon \nabla u(x, y) - \nabla \varphi(x,y)\ u(x, y) ) ) + u(x, y) = 1 </math>


p


<math>  \varphi(x, y) = x + y </math>
<math>  \varphi(x, y)\ =\ x + y </math>




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