Relative Tutte Polynomials for Colored Graphs and Virtual Knot Theory

Details Relative Tutte Polynomials for Colored Graphs and Virtual Knot Theory Relative Tutte Polynomials for Colored Graphs and Virtual Knot Theory

2009-09-07

arxiv.org/abs/0909.1301v1

Mathematics

Combinatorics

22 pages, 6 figures

Scientific paper

We introduce the concept of a relative Tutte polynomial of colored graphs. We show that this relative Tutte polynomial can be computed in a way similar to the classical spanning tree expansion used by Tutte in his original paper on this subject. We then apply the relative Tutte polynomial to virtual knot theory. More specifically, we show that the Kauffman bracket polynomial (hence the Jones polynomial) of a virtual knot can be computed from the relative Tutte polynomial of its face (Tait) graph with some suitable variable substitutions. Our method offers an alternative to the ribbon graph approach, using the face graph obtained from the virtual link diagram directly.

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