Distinguishing Legendrian knots with trivial orientation-preserving symmetry groupстатья
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Дата последнего поиска статьи во внешних источниках: 20 февраля 2024 г.
Аннотация:Recent work of I Dynnikov and M Prasolov proposes a new method of comparing Legendrian knots. In general, to apply the method requires a lot of technical work. In particular, one needs to search all rectangular diagrams of surfaces realizing certain dividing configurations. We show that in the case when the orientation-preserving symmetry group of the knot is trivial, this exhaustive search is not needed, which simplifies the procedure considerably. This allows one to distinguish Legendrian knots in certain cases when the computation of the known algebraic invariants is infeasible or not informative. In particular, we disprove that when A in R^3 is an annulus tangent to the standard contact structure along the boundary of A, then the two components of the boundary of A are always equivalent Legendrian knots. A candidate counterexample was proposed recently by Dynnikov and Prasolov, but the proof of the fact that the two components of the boundary of A are not Legendrian equivalent was not given. Now this work is accomplished. It is also shown here that the problem of comparing two Legendrian knots having the same topological type is algorithmically solvable provided that the orientation-preserving symmetry group of these knots is trivial.