where is a q-hypergeometric function.
q-Vandermonde Sum
See also
Chu-Vandermonde IdentityExplore with Wolfram|Alpha
References
Andrews, G. E. q-Series: Their Development and Application in Analysis, Number Theory, Combinatorics, Physics, and Computer Algebra. Providence, RI: Amer. Math. Soc., pp. 15-16, 1986.Referenced on Wolfram|Alpha
q-Vandermonde SumCite this as:
Weisstein, Eric W. "q-Vandermonde Sum." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/q-VandermondeSum.html