@misc{AverkovKruempelmannWeltge, author = {Averkov, Gennadiy and Kr{\"u}mpelmann, Jan and Weltge, Stefan}, title = {Notions of maximality for integral lattice-free polyhedra - the case of dimension three}, series = {arXiv.org : (math)}, journal = {arXiv.org : (math)}, pages = {45}, abstract = {Lattice-free sets (convex subsets of Rd without interior integer points) and their applications for cutting-plane methods in mixed-integer optimization have been studied in recent literature. Notably, the family of all integral lattice-free polyhedra which are not properly contained in another integral lattice-free polyhedron has been of particular interest. We call these polyhedra Zd-maximal. It is known that, for fixed d, the family Zd-maximal integral lattice-free polyhedra is finite up to unimodular equivalence. In view of possible applications in cutting-plane theory, one would like to have a classification of this family. However, this turns out to be a challenging task already for small dimensions. In contrast, the subfamily of all integral lattice-free polyhedra which are not properly contained in any other lattice-free set, which we call Rd-maximal lattice-free polyhedra, allow a rather simple geometric characterization. Hence, the question was raised for which dimensions the notions of Zd-maximality and Rd-maximality are equivalent. This was known to be the case for dimensions one and two. On the other hand, Nill and Ziegler (2011) showed that for dimension d≥4, there exist polyhedra which are Zd-maximal but not Rd-maximal. In this article, we consider the remaining case d=3 and prove that for integral polyhedra the notions of R3-maximality and Z3-maximality are equivalent. As a consequence, the classification of all R3-maximal integral polyhedra by Averkov, Wagner and Weismantel (2011) contains all Z3-maximal integral polyhedra.}, language = {en} }