I have a quick question on the regularized gamma function, defined as
$Q (a,z)=\frac{\Gamma(a,z)}{\Gamma(a)} \,. [1]$
What is the value of $Q (a,z)$ in the asymptotic limits $a \rightarrow \infty$ and $z \rightarrow \infty$ ?
[1] see http://mathworld.wolfram.com/RegularizedGammaFunction.html