DLMF:6.2.E1 (Q2211)

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DLMF:6.2.E1
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    Statements

    Defining formula
    E 1 ⁡ ( z ) = ∫ z ∞ e - t t ⁢ d t , exponential-integral 𝑧 superscript subscript 𝑧 superscript 𝑒 𝑡 𝑡 𝑡 {\displaystyle{\displaystyle E_{1}\left(z\right)=\int_{z}^{\infty}\frac{e^{-t}% }{t}\mathrm{d}t,}}
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    DLMF id
    DLMF:6.2.E1
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    constraint
    z ≠ 0 𝑧 0 {\displaystyle{\displaystyle z\neq 0}}
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