Fifth Yang–Baxter homology conjecture for the HOMFLYPT operator

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Let R(m)R_{(m)} be the level-mm Yang–Baxter operator yielding the HOMFLYPT polynomial, and let k=Z[y2]k=\mathbb{Z}[y^2]. The notation (m−1j)\binom{m-1}{j} denotes a binomial coefficient. Fifth-homology conjecture.

H5(R(m))≅k⊕∑j=05(m−1j)⊕(k1−y2)⊕(13(m−11)+124(m−12)+323(m−13)+332(m−14)+119(m−15))⊕(k1−y4)⊕(7(m−11)+16(m−12)+12(m−13)+4(m−14)).\begin{aligned} H_5(R_{(m)})&\cong k^{\oplus\sum_{j=0}^{5}\binom{m-1}{j}}\\ &\oplus\left(\frac{k}{1-y^2}\right)^{\oplus\left(13\binom{m-1}{1}+124\binom{m-1}{2}+323\binom{m-1}{3}+332\binom{m-1}{4}+119\binom{m-1}{5}\right)}\\ &\oplus\left(\frac{k}{1-y^4}\right)^{\oplus\left(7\binom{m-1}{1}+16\binom{m-1}{2}+12\binom{m-1}{3}+4\binom{m-1}{4}\right)}. \end{aligned}

The formula is extrapolated from explicit computations of lower-level chain complexes and is presented as a computational conjecture; no proof or resolution is supplied in the source.

References

Primary source

Anthony Christiana, Ben Clingenpeel, Huizheng Guo, Jinseok Oh, Jozef H. Przytycki, Xiao Wang and Hongdae Yun, “Low Dimensional Homology of the Yang-Baxter Operators Yielding the HOMFLYPT Polynomial”, arXiv:2502.20659 (2025).

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