$q$-difference equation for generalized trivariate $q$-Hahn polynomials
In this paper, we introduce a family of trivariate $q$-Hahn polynomials $Ψ_n^{(a)}(x,y,z|q)$ as a general form of Hahn polynomials $ψ_n^{(a)}(x|q),$ $ψ_n^{(a)}(x,y|q)$ and $F_n(x,y,z;q)$. We represent $Ψ_n^{(a)}(x,y,z|q)$ by the homogeneous $q$-difference operator $\widetilde{L}(a,b; θ_{xy})$ introduced by Srivastava {\it et al} [H. M. Srivastava, S. Arjika and A. Sherif Kelil, {\it Some homogeneous $q$-difference operators and the associated generalized Hahn polynomials}, Appl. Set-Valued Anal. Optim. {\bf 1} (2019), pp. 187--201.] to derive: extended generating, Rogers formula, extended Rogers formula and Srivastava-Agarwal type generating functions involving $Ψ_n^{(a)}(x,y,z|q)$ by the $q$-difference equation.
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