Extremal properties for triangulation based on empty convex set condition

We suggest to consider the empty condition for the special family of convex sets. For the given finite set $P\subset \mathbb{R}^n$ we shall say that empty condition for convex set $B\subset \mathbb{R}^n$ is fulfilled if $P\cap B=P\cap \partial B$. This condition is a generalization of the classic Delaunay empty sphere condition. We prove some extremal properties for the corresponding triangulations.