The weak Spread Out Simplices Conjecture

Let nΔd1n\Delta_{d-1} be the (d1)(d-1)-simplex dilated by nn. A collection of nn unit simplices in it is spread out if every subsimplex of size kk contains at most kk of them. An acyclic system of permutations is a system whose associated directed graph is acyclic for every pair of labels.

Weak Spread Out Simplices Conjecture. Any nn spread out simplices in nΔd1n\Delta_{d-1} can be achieved as the simplices of an acyclic system of permutations.

This is presented as the converse of the theorem asserting that the simplices arising from an acyclic system are spread out. The supplied status evidence identifies it as a counterexample to the Acyclic System Conjecture, so it is refuted.

Sources & referencesView supporting material

Primary source

Federico Ardila and Cesar Ceballos, “Acyclic systems of permutations and fine mixed subdivisions of simplices”, arXiv:1111.2966 (2013).

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