2004/07/31 by Lenhard Ng, Lisa Traynor
Mathematics · #math.SG #math.GT #msc:57R17 #msc:53D12 #msc:53D40
published as J. Symplectic Geom. 2 (2005), no. 3, 411-443 · 31 pages, to appear in J. Symplectic Geom.; v2: minor corrections based on referee comments
arxiv created 2004/12/02 · arxiv updated 2009/12/01
Differential graded algebra invariants are constructed for Legendrian links in the 1-jet space of the circle. In parallel to the theory for R3, Poincare-Chekanov polynomials and characteristic algebras can be associated to such links. The theory is applied to distinguish various knots, as well as links that are closures of Legendrian versions of rational tangles. For a large number of two-component links, the Poincare-Chekanov polynomials agree with the polynomials defined through the theory of generating functions. Examples are given of knots and links which differ by an even number of horizontal flypes that have the same polynomials but distinct characteristic algebras. Results obtainable from a Legendrian satellite construction are compared to results obtainable from the DGA and generating function techniques.