Affine symmetries of orbit polytopes
Affine symmetries of orbit polytopes
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轨道多面体的仿射对称性
DOI:
10.1016/j.aim.2015.10.021
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发表时间:
2016
影响因子:
1.7
通讯作者:
Frieder Ladisch
中科院分区:
文献类型:
--
作者:
Erik Friese;Frieder Ladisch
An orbit polytope is the convex hull of an orbit under a finite group G⩽ GL (d, R). We develop a general theory of possible affine symmetry groups of orbit polytopes. For every group, we define an open and dense set of generic points such that the orbit polytopes of generic points have conjugated affine symmetry groups. We prove that the symmetry group of a generic orbit polytope is again G if G is itself the affine symmetry group of some orbit polytope, or if G is absolutely irreducible. On the other hand, we describe some general cases where the affine symmetry group grows. We apply our theory to representation polytopes (the convex hull of a finite matrix group) and show that their affine symmetries can be computed effectively from a certain character. We use this to construct counterexamples to a conjecture of Baumeister et al. on permutation polytopes (Baumeister et al., 2009 [4, Conjecture 5.4]).
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