2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/170342In 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.12 pages, 5 figuresSymplectic Geometry53D20text