Skeleton graph

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Skeleton graph --- остов выпуклого конуса.

The skeleton graph of the convex cone C is the graph GC whose vertices are the extreme rays (a face of dimension 1) of C and there is an edge between two vertices if they are adjacent on C (two extreme rays of C are said to be adjacent on C, if they span a two-dimensional face of C).

The ridge graph of C is the graph GC whose vertices are the facets of C and there is an edge between two nodes if they are adjacent on C. So, the ridge graph of a convex cone is the skeleton of its dual.