Angewandte Mathematik Und Informatik Universit at Zu K Oln Onion Skins in Oriented Matroids

We generalize the following theorem to oriented matroids: Consider a polytope P and a facet F 0 of P, let H denote the hyperplanes spanned by F 0. Let d denote the diameter of the coskeleton of P. To each facet choose a deening inequality and let these set of inequalities F be partitioned by the distance of the corresponding facets to F 0 in the coskeleton of P into F = d