Publications [#243961] of Lenhard L. Ng

Papers Published

1. Ng, LL, Computable Legendrian invariants, Topology, vol. 42 no. 1 (January, 2003), pp. 55-82, Elsevier BV [math.GT/0011265], [doi]
   (last updated on 2026/01/15)

   Abstract:
   We establish tools to facilitate the computation and application of the Chekanov-Eliashberg differential graded algebra (DGA), a Legendrian-isotopy invariant of Legendrian knots and links in standard contact three space. More specifically, we reformulate the DGA in terms of front projections, and introduce the characteristic algebra, a new invariant derived from the DGA. We use our techniques to distinguish between several previously indistinguishable Legendrian knots and links. © 2002 Elsevier Science Ltd. All rights reserved.