Journal
INVENTIONES MATHEMATICAE
Volume 177, Issue 3, Pages 571-597Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00222-009-0190-x
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- NSF
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Let (M, omega) be a symplectic 4-manifold. A semitoric integrable system on (M, omega) is a pair of smooth functions J, H is an element of C-infinity( M, R) for which J generates a Hamiltonian S-1-action and the Poisson brackets {J, H} vanish. We shall introduce new global symplectic invariants for these systems; some of these invariants encode topological or geometric aspects, while others encode analytical information about the singularities and how they stand with respect to the system. Our goal is to prove that a semitoric system is completely determined by the invariants we introduce.
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