Xavier Holt added begin_defi_Let_mathcal_X__.tex  about 8 years ago

Commit id: 8a9793e8992e9b55b6b4daae192ba145d02996f5

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\begin{defi}  Let $\mathcal{X}$ be a point-set. We define $C(\mathcal{X})$ to be its convex-hull, $B(\mathcal{X})$ to be the polygonal boundary of this hull and $V(\mathcal{X})$ to be the vertices of this boundary.  \end{defi}