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Convexity and unitary representations of nilpotent Lie groups

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The moment map of symplectic geometry is extended to associate to any unitary representation of a nilpotent Lie group aG-invariant subset of the dual of the Lie algebra. We prove that this subset is the closed conex hull of the Kirillov orbit of the representation.

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Supported by NSERC research grant no. A7918

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Wildberger, N.J. Convexity and unitary representations of nilpotent Lie groups. Invent Math 98, 281–292 (1989). https://doi.org/10.1007/BF01388854

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  • DOI: https://doi.org/10.1007/BF01388854

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