Bergeron–Ceballos–Küstner's unimodality conjecture for q-Fibonomial coefficients

From papers

For m,nNm,n\in\mathbb{N}, define the qq-Fibonomial coefficient by

[!m+nn!]F:=[Fm+n]q![Fm]q!,[Fn]q!,\left[\\!\begin{matrix} m+n \\\\ n \end{matrix}\\!\right]_{\mathcal{F}}:=\frac{[F_{m+n}]^!_q}{[F_m]^!_q\\,[F_n]^!_q},

where [Fn]q!:=k=1n[Fk]q[F_n]^!_q:=\prod_{k=1}^n[F_k]_q and [n]q:=1+q++qn1[n]_q:=1+q+\dots+q^{n-1}. Bergeron–Ceballos–Küstner's conjecture. The polynomials

[!m+n !]F\left[\\!\begin{matrix}m+n\\\ \end{matrix}\\!\right]_{\mathcal{F}}

are unimodal. Bergeron–Ceballos–Küstner introduced these polynomials and conjectured unimodality, while the source proves the conjecture for n3n\leq 3; the general case remains open.

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Sources & referencesView supporting material

Primary source

Brendan B. Connelly, Ezekiel Ito, Thomas C. Martinez, Olha Shevchenko and Kacey Yang, “Unimodality of q-Fibonomial coefficients for small cases”, arXiv:2605.12822 (2026).

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