Digital Library of Mathematical Functions
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8 Incomplete Gamma and Related FunctionsIncomplete Gamma Functions

§8.15 Sums

8.15.1 γ(a,λx)=λak=0γ(a+k,x)(1-λ)kk!.

For sums of infinite series whose terms include incomplete gamma functions, see Prudnikov et al. (1986b, §5.2).