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Shu-Tao Jiang

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Preprint Oct 2026

A proof of the Berkovich-Dhar conjecture modulo three

Let $P_n(q)=\prod_{j=1}^n(1-q^{3j-2})(1-q^{3j-1})$. For each $p\in\{4,5,6,7,8\}$, we prove that the coefficients of $P_n(q)^p$ in residue class $0$ modulo $3$ are nonnegative, and that those in residue class $2$, after zero terms are omitted, change sign exactly once, from positive to negative. The residue-$0$ coeffici...

Shu-Tao Jiang · 0 citations
Preprint Oct 2026

A proof of the Berkovich-Dhar conjecture modulo five

We prove the sign-pattern and limiting-transition assertions of the Berkovich--Dhar conjecture modulo five, covering both the square and the cube of the finite Borwein product. In each power, the coefficients in residue class zero are strictly positive, while the sequences in residue classes three and four have exactly...

Shu-Tao Jiang · 0 citations

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