11.07.2015 Views

International Congress of Mathematicians

International Congress of Mathematicians

International Congress of Mathematicians

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392 Yu. V. ChekanovFigure 5: Local decompositions(4) Every switching crossing is Maslov.We call a decomposition admissible if it satisfies Conditions (l)-(3), and gradedadmissible if it also satisfies Condition (4). Denote by Adm(S) (resp. Adm + (S))the set <strong>of</strong> admissible (resp. graded admissible) decompositions <strong>of</strong> S. Given D £Adm(S), denote by Sw(£>) the set <strong>of</strong> its switching points. Define 0(D) = #(-D)) —#(Sw(D)).Theorem 3.1. If a-generic Legendrian knots L,L' c R 3 are Legendrian isotopiethen there exists a one-to-one mapping g: Adm(

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