DLMF:15.12.E1 (Q5161)

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DLMF:15.12.E1
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    α ± = arctan ( ph z - ph ( 1 - z ) π ln | 1 - z - 1 | ) , subscript 𝛼 plus-or-minus minus-or-plus phase 𝑧 phase 1 𝑧 𝜋 1 superscript 𝑧 1 {\displaystyle{\displaystyle\alpha_{\pm}=\operatorname{arctan}\left(\frac{% \operatorname{ph}z-\operatorname{ph}\left(1-z\right)\mp\pi}{\ln|1-z^{-1}|}% \right),}}
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    DLMF:15.12.E1
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    π {\displaystyle{\displaystyle\pi}}
    C3.S12.E1.m2adec
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    arctan z 𝑧 {\displaystyle{\displaystyle\operatorname{arctan}\NVar{z}}}
    C4.S23.SS2.p1.m7adec
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