Smooth invariants of focus-focus singularities and obstructions to product decomposition

We study focus-focus singularities (also known as nodal singularities, or pinched tori) of Lagrangian fibrations on symplectic 4-manifolds. We show that, in contrast to elliptic and hyperbolic singularities, there exist homeomorphic focus-focus singularities which are not diffeomorphic. Furthermore,...

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Bibliographic Details

Main Authors:	Alexey Bolsinov, Anton Izosimov
Format:	Default Article
Published:	2020
Subjects:	Other mathematical sciences not elsewhere classified untagged Mathematical Sciences not elsewhere classified
Online Access:	https://hdl.handle.net/2134/34775
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