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Allen Knutson
Allen Knutson
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At the end of the introduction of Guillemin-Sternberg's 1982 Inventiones paper "Convexity Properties of the Moment Mapping", there is a nice picture of a non-Abelian moment polytope attributed to HeckmannHeckman. Is this example worked out somewhere in more detail? Also, are you aware of other illustrations of the intricacies of the non-Abelian convexity theorem?

At the end of the introduction of Guillemin-Sternberg's 1982 Inventiones paper "Convexity Properties of the Moment Mapping", there is a nice picture of a non-Abelian moment polytope attributed to Heckmann. Is this example worked out somewhere in more detail? Also, are you aware of other illustrations of the intricacies of the non-Abelian convexity theorem?

At the end of the introduction of Guillemin-Sternberg's 1982 Inventiones paper "Convexity Properties of the Moment Mapping", there is a nice picture of a non-Abelian moment polytope attributed to Heckman. Is this example worked out somewhere in more detail? Also, are you aware of other illustrations of the intricacies of the non-Abelian convexity theorem?

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Michael
Michael
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Example in Guillemin-Sternberg's Convexity Paper

At the end of the introduction of Guillemin-Sternberg's 1982 Inventiones paper "Convexity Properties of the Moment Mapping", there is a nice picture of a non-Abelian moment polytope attributed to Heckmann. Is this example worked out somewhere in more detail? Also, are you aware of other illustrations of the intricacies of the non-Abelian convexity theorem?