English

Two new families of q-positive integers

Combinatorics 2007-05-23 v2

Abstract

Let n,p,kn,p,k be three positive integers. We prove that the rational fractions of qq: [nk]q3ϕ2[.matrixq1k,qp,qpnq,q1nmatrixq;qk+1]andq(np)p\qbinkq3ϕ2[.matrixq1k,qp,qpnq,q1nmatrixq;q]{n \brack k}_{q} {}_3\phi_{2} [ . {matrix}q^{1-k},q^{-p},q^{p-n} q,q^{1-n} {matrix}| q;q^{k+1}]\quad\textrm{and}\quad q^{(n-p)p}\qbi{n}{k}{q} {}_3\phi_2[ . {matrix}q^{1-k},q^{-p},q^{p-n} q,q^{1-n} {matrix}|q;q] are polynomials of qq with positive integer coefficients. This generalizes a recent result of Lassalle (Ann. Comb. 6(2002), no. 3-4, 399-405), in the same way as the classical qq-binomial coefficients refine the ordinary binomial coefficients.

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Cite

@article{arxiv.math/0403064,
  title  = {Two new families of q-positive integers},
  author = {Sharon J. X. Hou and Jiang Zeng},
  journal= {arXiv preprint arXiv:math/0403064},
  year   = {2007}
}

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12 pages