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In this note we give some sufficient conditions for a CMC-hypersurface in a Riemannian manifold N to be invariant under the 1-parameter group of isometries generated by a Killing field on N. Our main result improves on previous ones by D. Hoffman, R. Osserman, and R. Schoen and S. Fornari and J. Ripoll, and hinges on a new, simple existence theorem for a first zero of solutions of an ODE naturally...
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