| (Oral XCachan Psi) Soit {X_1,X_2,Y} trois v.a.r. indépendantes, où {\begin{cases}X_{1}\leadsto\mathcal{P}(\lambda_1)\\X_{2}\leadsto\mathcal{P}(\lambda_2)\end{cases}\;\text{et}\;\begin{cases}Y(\Omega)\subset\{-1,1\}\\p=\mathbb{P}(Y=-1)\end{cases}}On pose {M=\begin{pmatrix} X_{1}^{2} & X_{2}^{2} \\ YX_{2}^{2} & X_{1}^{2}\end{pmatrix}}.
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