DLMF:1.17.E17 (Q676): Difference between revisions

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DLMF:1.17.E17
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    1 2 π k = - e - i k a ( - π π ϕ ( x ) e i k x d x ) = ϕ ( a ) , 1 2 𝜋 superscript subscript 𝑘 superscript 𝑒 𝑖 𝑘 𝑎 superscript subscript 𝜋 𝜋 italic-ϕ 𝑥 superscript 𝑒 𝑖 𝑘 𝑥 𝑥 italic-ϕ 𝑎 {\displaystyle{\displaystyle\frac{1}{2\pi}\sum_{k=-\infty}^{\infty}e^{-ika}% \left(\int_{-\pi}^{\pi}\phi(x)e^{ikx}\mathrm{d}x\right)=\phi(a),}}
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    DLMF:1.17.E17
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