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Paper detail

Polar orbitopes

We study polar orbitopes, i.e. convex hulls of orbits of a polar representation of a compact Lie group. The face structure is studied by means of the gradient momentum map and it is shown that every face is exposed and is again a polar orbitope. Up to conjugation the faces are completely determined by the momentum polytope. There is a tight relation with parabolic subgroups: the set of extreme points of a face is the closed orbit of a parabolic subgroup of G and for any parabolic subgroup the closed orbit is of this form.

preprint2013arXivOpen access
Leonardo BiliottiAlessandro GhigiPeter Heinzner
math.RTmath.DG
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Leonardo BiliottiAlessandro GhigiPeter Heinzner

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