| (Oral X-Cachan Psi) Soit {u_{0}\colon\mathbb{R}\to\mathbb{R}} de classe {{\mathcal C}^{1}}. On cherche les {u}, {{\mathcal C}^{2}} sur {\mathbb{R}^2}, telles que : {\dfrac{\partial u}{\partial t} + 2tx\dfrac{\partial u}{\partial x} = 0\ \text{et}\ u(0,x) = u_{0}(x)}
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