Theoretical results
This generalize the previous results of [NgRe06] (α=0):
Our Main Theorem [DuNg12] (informal)
Under α-weak-orthogonality condition, some local minima of 4th order momentum of a sphered-zonotope are O(αk)-close to its spanning vectors
Theorem [NgRe06] (restated)
The global minima of 4th order momentum of an hypercubes, match exactly its spanning vectors