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Why is $tb(K)$ (Thurston-Bennequin invariant) of a Legendrian knot $K$ which is the boundary of a convex surface $\Sigma$ is negative in a contact 3 manifold? |
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Why is tb < 0 for boundary of a convex surface?Why is $tb(K)$ (Thurston-Bennequin invariant) of a knot $K$ which is the boundary of a convex surface $\Sigma$ is negative in a contact 3 manifold?
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