Circular LLT power-sum positivity conjecture

Let ν{\boldsymbol\nu} determine a circular vertical strip digraph. Circular LLT power-sum positivity conjecture. Then ωGν(x;q+1)\omega \mathrm{G}_{\boldsymbol\nu}(\mathbf{x};q+1) is p\mathrm{p}-positive. Furthermore, if

ωGν(x;q+1)=λcν,λ(q)pλ(x)zλ,\omega \mathrm{G}_{\boldsymbol\nu}(\mathbf{x};q+1)=\sum_{\lambda}c_{{\boldsymbol\nu},\lambda}(q)\frac{\mathrm{p}_\lambda(\mathbf{x})}{z_\lambda},

the coefficients cν,λ(q)c_{{\boldsymbol\nu},\lambda}(q) are polynomials with unimodal and non-negative integer coefficients. This is proposed from computer experiments as a generalization of a known positivity result and remains open.

Sources & referencesView supporting material

Primary source

Per Alexandersson and Greta Panova, “LLT polynomials, chromatic quasisymmetric functions and graphs with cycles”, arXiv:1705.10353 (2017).

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