DLMF:2.11.E7 (Q1032)

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DLMF:2.11.E7
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    Defining formula
    E p ⁡ ( z ) ∼ 2 ⁢ π ⁢ i ⁢ e - p ⁢ π ⁢ i Γ ⁡ ( p ) ⁢ z p - 1 + e - z z ⁢ ∑ s = 0 ∞ ( - 1 ) s ⁢ ( p ) s z s , asymptotic-expansion exponential-integral-En 𝑝 𝑧 2 𝜋 𝑖 superscript 𝑒 𝑝 𝜋 𝑖 Euler-Gamma 𝑝 superscript 𝑧 𝑝 1 superscript 𝑒 𝑧 𝑧 superscript subscript 𝑠 0 superscript 1 𝑠 Pochhammer 𝑝 𝑠 superscript 𝑧 𝑠 {\displaystyle{\displaystyle E_{p}\left(z\right)\sim\frac{2\pi ie^{-p\pi i}}{% \Gamma\left(p\right)}z^{p-1}+\frac{e^{-z}}{z}\sum_{s=0}^{\infty}(-1)^{s}\frac{% {\left(p\right)_{s}}}{z^{s}},}}
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    DLMF id
    DLMF:2.11.E7
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