The indecomposability conjecture for a Lagrangian concordance from the trefoil

Let WJ1(S1)W\subset J^1(S^1) be the Legendrian Whitehead double pattern, let UU be the standard Legendrian unknot, and let Λ\Lambda be the Legendrian 946\overline{9_{46}} knot with a Lagrangian concordance UΛU\prec\Lambda. The satellite S(U,W)S(U,W) is the Legendrian right-handed trefoil TT with tb=1tb=1, and applying the satellite construction gives a Lagrangian concordance CC from TT to S(Λ,W)S(\Lambda,W). Indecomposability conjecture. The Lagrangian concordance CC from TT to S(Λ,W)S(\Lambda,W) is not decomposable. This would show that not all Lagrangian concordances are decomposable, contrary to the tempting conjecture mentioned immediately beforehand.

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Primary source

Christopher R. Cornwell, Lenhard Ng and Steven Sivek, “Obstructions to Lagrangian concordance”, arXiv:1411.1364 (2014).

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