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7 results for push-off

In this article we give necessary and sufficient conditions for two triples of integers to be realized as the Thurston-Bennequin number and the rotation number of a Legendrian theta-graph with all cycles unknotted. We show that these invariants are not enough to determine the Legendrian class of a topologically planar …

2013-03-08abs ↗pdf ↗

For any knot T transverse to a given contact structure on a 3-manifold, we exhibit a Legendrian two-component link such that T equals the transverse push-off of one of the link components and contact (+1)-surgery on the link has the same effect as a Lutz twist along T.

2004-01-24abs ↗pdf ↗

A new inequality linking submanifold's topology to its Reeb chords count.

problem Establishing a relationship between Legendrian submanifolds' topology and their Reeb chords count.
method Using a Mayer--Vietoris sequence for Lagrangian Floer homology, obtained by neck-stretching and splashing, under a small contact isotopy.
result The number of Reeb chords is at least the sum of the Z2\mathbb{Z}_2-Betti numbers of the submanifold.

The paper proves compactness for holomorphic curves with boundary on nearby Lagrangians.

problem Compactness of holomorphic curves with boundary on nearby Lagrangians.
method Generalizes earlier work on compactness, proving a limit configuration of holomorphic curves joined by gradient flow lines.
result Exponential estimate analyzing the interface between holomorphic parts and gradient flow lines.

The paper proves inequalities for links in tight contact 3-manifolds.

problem Proving inequalities for links in tight contact 3-manifolds.
method Using tight contact structures and specific inequalities for transverse and Legendrian links.
result Sharp inequalities for the self-linking number of transverse and Legendrian links.