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Matrice Hausienne
Soit \(f:\Bbb R^2\to \Bbb R\), \(f\in{{\mathcal C^2(\Bbb R^2)}}\)
La matrice Hausienne:
$$H_{M}={{\begin{pmatrix}\frac{\partial^2 f}{\partial x^2}(M)&\frac{\partial^2 f}{\partial x\partial y}(M)\\ \frac{\partial^2f}{\partial y \partial x}(M)&\frac{\partial^2f}{\partial y^2}(M)\end{pmatrix} }}$$
\(\to\) Propriétés:
