Mathematics – Combinatorics
Scientific paper
2012-04-01
Mathematics
Combinatorics
5 pages, two open problems are added
Scientific paper
For any integer $r\geqslant 2$, using the $q$-Pfaff-Saalsch\"utz identity, we prove that there exists a (unique) sequence of Laurent polynomials $\{b^{(r)}_k(q)\}_{k=0}^\infty$ in $q$ with nonnegative integral coefficients such that \sum_{k=0}^n q^{-rnk} {n\brack k}^r {n+k\brack k}^r =\sum_{k=0}^n q^{-nk} {n\brack k}{n+k\brack k}b^{(r)}_k(q), where ${n\brack k}$ denotes the $q$-binomial coefficient. This gives a new solution to Zudilin's question about finding a $q$-analogue of Schmidt's problem.
Guo Victor J. W.
Zeng Jiang
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