Extensions de quelques théorèmes de densité
Rank forms, closed zones and laminae
For a given lattice, we establish an equivalence between closed zones for the corresponding Voronoï polytope, suitable hyperplane sections of the corresponding Delaunay partition, and rank quadratic forms which are extreme rays for the corresponding -type domain.
The hypermetric cone on seven vertices.
Goldberg-Coxeter construction for 3- and 4-valent plane graphs.
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