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    • Knot contact homology 

      Ng, Lenhard; Ekholm, Tobias; Etnyre, John B; Sullivan, Michael G (Geometry & Topology, 2013-04-30)
      The conormal lift of a link K in ℝ3is a Legendrian submanifold ∧Kin the unit cotangent bundle U*ℝ3of ℝ3with contact structure equal to the kernel of the Liouville form. Knot contact homology, a topological link invariant ...