Dougall's Formula
For 👁 R[a+b-c-d]<-1
and 👁 a
and 👁 b
not integers,
![👁 R[a+b-c-d]<-1](https://mathworld.wolfram.com/images/equations/DougallsFormula/Inline1.svg){kind=link}
See also
Gamma FunctionExplore with Wolfram|Alpha
More things to try:
References
Erdélyi, A.; Magnus, W.; Oberhettinger, F.; and Tricomi, F. G. Higher Transcendental Functions, Vol. 1. New York: Krieger, p. 7, 1981.Referenced on Wolfram|Alpha
Dougall's FormulaCite this as:
Weisstein, Eric W. "Dougall's Formula." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/DougallsFormula.html