On deformations of Hamiltonian actions
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actionscompactdeformationshamiltoniansymplecticcoisotropicformgeneralize
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In this paper we generalize to coisotropic actions of compact Lie groups a theorem of Guillemin on deformations of Hamiltonian structures on compact symplectic manifolds. We show how one can reconstruct from the moment polytope the symplectic form on the manifold.
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