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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>

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