Some remarks on the chord index
arXiv:1811.09061 · doi:10.1142/S0218216520420031
Abstract
In this paper we discuss how to define a chord index via smoothing a real crossing point of a virtual knot diagram. Several polynomial invariants of virtual knots and links can be recovered from this general construction. We also explain how to extend this construction from virtual knots to flat virtual knots.
20 pages, 15 figures