Mathematics – Geometric Topology
Scientific paper
1999-06-10
Journal of Knot Theory and its Ramifications, 9(3):311-339, May 2000
Mathematics
Geometric Topology
28 pages, 6 figures. <Author: http://www.kurims.kyoto-u.ac.jp/~ddw/> Minor corrections and references added since version 1
Scientific paper
This paper describes a method for the automatic evaluation of the Links-Gould two-variable polynomial link invariant (LG) for any link, given only a braid presentation. This method is currently feasible for the evaluation of LG for links for which we have a braid presentation of string index at most 5. Data are presented for the invariant, for all prime knots of up to 10 crossings and various other links. LG distinguishes between these links, and also detects the chirality of those that are chiral. In this sense, it is more sensitive than the well-known two-variable HOMFLY and Kauffman polynomials. When applied to examples which defeat the HOMFLY invariant, interestingly, LG `almost' fails. The automatic method is in fact applicable to the evaluation of any such state sum invariant for which an appropriate R matrix and cap and cup matrices have been determined.
Wit David de
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