Piles of Cubes, Monotone Path Polytopes and Hyperplane Arrangements

Details Piles of Cubes, Monotone Path Polytopes and Hyperplane Arrangements Piles of Cubes, Monotone Path Polytopes and Hyperplane Arrangements

1997-01-02

arxiv.org/abs/math/9701207v1

Mathematics

Combinatorics

Scientific paper

Monotone path polytopes arise as a special case of the construction of fiber polytopes, introduced by Billera and Sturmfels. A simple example is provided by the permutahedron, which is a monotone path polytope of the standard unit cube. The permutahedron is the zonotope polar to the braid arrangement. We show how the zonotopes polar to the cones of certain deformations of the braid arrangement can be realized as monotone path polytopes. The construction is an extension of that of the permutahedron and yields interesting connections between enumerative combinatorics of hyperplane arrangements and geometry of monotone path polytopes.

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