DLMF:6.6.E2 (Q2249)

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DLMF:6.6.E2
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    test
    E 1 ⁡ ( z ) = - γ - ln ⁡ z - ∑ n = 1 ∞ ( - 1 ) n ⁢ z n n ! ⁢ n . exponential-integral 𝑧 𝑧 superscript subscript 𝑛 1 superscript 1 𝑛 superscript 𝑧 𝑛 𝑛 𝑛 {\displaystyle{\displaystyle E_{1}\left(z\right)=-\gamma-\ln z-\sum_{n=1}^{% \infty}\frac{(-1)^{n}z^{n}}{n!\thinspace n}.}}
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    DLMF:6.6.E2
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