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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