On Legendrian knots and polynomial invariants

Details On Legendrian knots and polynomial invariants On Legendrian knots and polynomial invariants

2000-02-29

arxiv.org/abs/math/0002250v3

Mathematics

Geometric Topology

8 pages, uses pstricks

Scientific paper

It is proved in this note that the analogues of the Bennequin inequality which provide an upper bound for the Bennequin invariant of a Legendrian knot in the standard contact three dimensional space in terms of the lower degree in the framing variable of the HOMFLY and the Kauffman polynomials are not sharp. Furthermore, the relationships between these restrictions on the range of the Bennequin invariant are investigated, which leads to a new simple proof of the inequality involving the Kauffman polynomial.

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