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arxiv: math/0208245 · v1 · submitted 2002-08-30 · 🧮 math.SG · math.DS

On semi-global invariants for focus-focus singularities

classification 🧮 math.SG math.DS
keywords focus-focussingularsymplecticarticleclassificationcompletelydimensionalequivalence
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This article gives a classification, up to symplectic equivalence, of singular Lagrangian foliations given by a completely integrable system of a 4-dimensional symplectic manifold, in a full neighbourhood of a singular leaf of focus-focus (=nodal) type.

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