Properties of the zeros of generalized basic hypergeometric polynomials

We define the generalized basic hypergeometric polynomial of degree $N \geq 1$ in terms of the generalized basic hypergeometric function, which depends on (arbitrary, generic, possibly complex) parameters $q \neq 1$, the $r \geq 0$ parameters $α_{j}$ and the $s \geq 0$ parameters $β_{k}$. In this paper we obtain a set of $N$ nonlinear algebraic equations satisfied by the $N$ zeros $ζ_{n}\equiv ζ_{n}\left( \underline{α},\underline{β};q;N\right)$ of this polynomial. We moreover identify an $\left( N\times N\right)$-matrix $\underline{M}\equiv \underline{M}\left( \underline{α},\underline{β};\underline{ζ};q;N\right)$ featuring the $N$ eigenvalues $μ_{n}=-q^{\left( s-r\right) \left( N-n\right) }\left(q^{-n}-1\right) ~\prod\limits_{j=1}^{r}\left( α_{j}~q^{N-n}-1\right)$, where $n=1,2,...,N.$ These $N$ eigenvalues depend only on the $r$ parameters $α_{j}$ (besides $q$ and $N$), implying that the $\left( N\times N\right)$-matrix $\underline{M}$ is isospectral for variations of the $s$ parameters $β_{k}$; and they clearly are rational numbers if $q$ and the $r$ parameters $α_{j}$ are themselves rational numbers: a nontrivial Diophantine property.

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