Diameter, Decomposability, and Minkowski Sums of Polytopes. Issue 4 (December 2019)

• Record Type: Journal Article
• Authors: Deza, Antoine; Pournin, Lionel
• Is Part Of: Canadian mathematical bulletin =. Volume 62:Issue 4(2019)
• Page Start: 741
• Page End: 755
• Publication Date: 2019-12
• Subjects: 05C12, -- 52B11; Minkowski sum, -- polytope, -- diameter, -- decomposability; Mathematics -- Periodicals; Mathematics; Periodicals; 510.5
• DOI: 10.4153/S0008439518000668
• Languages: English
• ISSNs: 0008-4395

Abstract

Abstract: We investigate how the Minkowski sum of two polytopes affects their graph and, in particular, their diameter. We show that the diameter of the Minkowski sum is bounded below by the diameter of each summand and above by, roughly, the product between the diameter of one summand and the number of vertices of the other. We also prove that both bounds are sharp. In addition, we obtain a result on polytope decomposability. More precisely, given two polytopes $P$ and $Q$, we show that $P$ can be written as a Minkowski sum with a summand homothetic to $Q$ if and only if $P$ has the same number of vertices as its Minkowski sum with $Q$ .