Examples of circle actions on symplectic spaces
Christopher Allday (1998)
Banach Center Publications
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Christopher Allday (1998)
Banach Center Publications
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John Oprea (1998)
Banach Center Publications
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Cornelia Vizman (2011)
Archivum Mathematicum
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Differential forms on the Fréchet manifold of smooth functions on a compact -dimensional manifold can be obtained in a natural way from pairs of differential forms on and by the hat pairing. Special cases are the transgression map (hat pairing with a constant function) and the bar map (hat pairing with a volume form). We develop a hat calculus similar to the tilda calculus for non-linear Grassmannians [6].
Goldberg, Timothy E. (2010)
SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
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Chris Woodward (2010)
Les cours du CIRM
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Chris Woodward (2010)
Les cours du CIRM
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David T. Gay, Margaret Symington (2009)
Journal of the European Mathematical Society
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A near-symplectic structure on a 4-manifold is a closed 2-form that is symplectic away from the 1-dimensional submanifold along which it vanishes and that satisfies a certain transversality condition along this vanishing locus. We investigate near-symplectic 4-manifolds equipped with singular Lagrangian torus fibrations which are locally induced by effective Hamiltonian torus actions. We show how such a structure is completely characterized by a singular integral affine structure on...