Patterns of the V2-Polynomial of Knots

Recently, Kashaev and the first author constructed an R-matrix from a Nichols algebra with an automorphism, that leads, via the Reshetikhin–Turaev functor, to a multivariable polynomial invariant of knots. Applying this to a rank 2 Nichols algebra, results in a sequence Vn of 2-variable knot polynomials with integer coefficients, the first polynomial been identified with the Links–Gould polynomial. In this note we present the results of the computation of the Vn-polynomials for n=1,2,3,4. This leads to the discovery of emerging patterns, including the genus bound for V2 being an equality for all 352.2 million knots with at most 19 crossings, as well as unexpected Conway mutations that seem undetected by the Vn-polynomials as well as by Heegaard Floer Homology and Khovanov Homology.

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Publication Details

Journal
Experimental Mathematics
Published
2026-06-26
DOI
https://doi.org/10.1080/10586458.2026.2651081
Primary Topic
Geometric and Algebraic Topology
Type
preprint
Field-Weighted Citation Impact
0.00

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preprint

Patterns of the V2-Polynomial of Knots

Shana Yunsheng Li, Stavros Garoufalidis
Experimental Mathematics
Geometric and Algebraic Topology
preprint

Patterns of the V2-Polynomial of Knots

Shana Yunsheng Li, Stavros Garoufalidis
preprint en

Abstract

Recently, Kashaev and the first author constructed an R-matrix from a Nichols algebra with an automorphism, that leads, via the Reshetikhin–Turaev functor, to a multivariable polynomial invariant of knots. Applying this to a rank 2 Nichols algebra, results in a sequence Vn of 2-variable knot polynomials with integer coefficients, the first polynomial been identified with the Links–Gould polynomial. In this note we present the results of the computation of the Vn-polynomials for n=1,2,3,4. This leads to the discovery of emerging patterns, including the genus bound for V2 being an equality for all 352.2 million knots with at most 19 crossings, as well as unexpected Conway mutations that seem undetected by the Vn-polynomials as well as by Heegaard Floer Homology and Khovanov Homology.

Experimental Mathematics
University of Illinois Urbana-Champaign (US), Southern University of Science and Technology (CN)
National Science Foundation
Openalex Percentile: Top 96%
Geometric and Algebraic Topology
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Patterns of the V2-Polynomial of Knots — Shana Yunsheng Li, Stavros Garoufalidis · Experimental Mathematics (2026) | TGRS Research Map | TGRS