The Combinatorics of Interval Vector Polytopes

Matthias Beck, Jessica De Silva, Gabriel Dorfsman-Hopkins, Joseph Pruitt, Amanda Ruiz

Abstract


An interval vector is a $(0,1)$-vector in $\mathbb{R}^n$ for which all the $1$'s appear consecutively, and an interval vector polytope is the convex hull of a set of interval vectors in $\mathbb{R}^n$. We study three particular classes of interval vector polytopes which exhibit interesting geometric-combinatorial structures; e.g., one class has volumes equal to the Catalan numbers, whereas another class has face numbers given by the Pascal 3-triangle.


Keywords


Interval vector; lattice polytope; Ehrhart polynomial; root polytope; Catalan number; $f$-vector

Full Text: PDF