DLMF:7.18.E14 (Q2464)

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DLMF:7.18.E14
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    i n erfc ( z ) 2 π e - z 2 ( 2 z ) n + 1 m = 0 ( - 1 ) m ( 2 m + n ) ! n ! m ! ( 2 z ) 2 m , asymptotic-expansion repeated-integral-complementary-error-function 𝑛 𝑧 2 𝜋 superscript 𝑒 superscript 𝑧 2 superscript 2 𝑧 𝑛 1 superscript subscript 𝑚 0 superscript 1 𝑚 2 𝑚 𝑛 𝑛 𝑚 superscript 2 𝑧 2 𝑚 {\displaystyle{\displaystyle\mathop{\mathrm{i}^{n}\mathrm{erfc}}\left(z\right)% \sim\frac{2}{\sqrt{\pi}}\frac{e^{-z^{2}}}{(2z)^{n+1}}\sum_{m=0}^{\infty}\frac{% (-1)^{m}(2m+n)!}{n!m!(2z)^{2m}},}}
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    | ph z | 3 4 π - δ ( < 3 4 π ) phase 𝑧 annotated 3 4 𝜋 𝛿 absent 3 4 𝜋 {\displaystyle{\displaystyle|\operatorname{ph}z|\leq\tfrac{3}{4}\pi-\delta(<% \tfrac{3}{4}\pi)}}
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    z 𝑧 {\displaystyle{\displaystyle z\to\infty}}
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    | ph z | 3 4 π - δ ( < 3 4 π ) ph 𝑧 annotated 3 4 𝜋 𝛿 absent 3 4 𝜋 {\displaystyle{\displaystyle|\operatorname{ph}z|\leq\tfrac{3}{4}\pi-\delta(<% \tfrac{3}{4}\pi)}}
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