DLMF:8.11.E5 (Q2576)

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DLMF:8.11.E5
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    P ( a , z ) z a e - z Γ ( 1 + a ) ( 2 π a ) - 1 2 e a - z ( z / a ) a , asymptotically-equals incomplete-gamma-P 𝑎 𝑧 superscript 𝑧 𝑎 superscript 𝑒 𝑧 Euler-Gamma 1 𝑎 asymptotically-equals superscript 2 𝜋 𝑎 1 2 superscript 𝑒 𝑎 𝑧 superscript 𝑧 𝑎 𝑎 {\displaystyle{\displaystyle P\left(a,z\right)\sim\frac{z^{a}e^{-z}}{\Gamma% \left(1+a\right)}\sim(2\pi a)^{-\frac{1}{2}}e^{a-z}(z/a)^{a},}}
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    | ph a | π - δ phase 𝑎 𝜋 𝛿 {\displaystyle{\displaystyle|\operatorname{ph}a|\leq\pi-\delta}}
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