On the refinements of a polyhedral subdivision
- Autores: Francisco de Santos
- Localización: Collectanea mathematica, ISSN 0010-0757, Vol. 52, Fasc. 3, 2001, págs. 231-256
- Idioma: inglés
- Títulos paralelos:
- Refinamientos de una subdivisión poliedral
- Enlaces
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Resumen
Let pi: P --> Q be an affine projection map between two polytopes P and Q. Billera and Sturmfels introduced in 1992 the concept of polyhedral subdivisions of Q induced by pi (or pi-induced) and the fiber polytope of the projection: a polytope Sygma(P,pi) of dimension dim(P)-dim(Q) whose faces are in correspondence with the coherent pi-induced subdivisions (or pi-coherent subdivisions). In this paper we investigate the structure of the poset of pi-induced refinements of a pi-induced subdivision. In particular, we define the refinement polytope associated to any pi-induced subdivision S, which is a generalization of the fiber polytope and shares most of its properties. As applications to the theory we prove that if a point configuration has non-regular subdivisions then it has non-regular triangulations and we provide simple proofs of the existence of non-regular subdivisions for many particular point configurations.
