DLMF:6.11.E2 (Q2287)

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DLMF:6.11.E2
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    Defining formula
    E 1 ⁡ ( z ) = e - z ⁢ U ⁡ ( 1 , 1 , z ) , exponential-integral 𝑧 superscript 𝑒 𝑧 Kummer-confluent-hypergeometric-U 1 1 𝑧 {\displaystyle{\displaystyle E_{1}\left(z\right)=e^{-z}U\left(1,1,z\right),}}
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    DLMF id
    DLMF:6.11.E2
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