DLMF:1.17.E21 (Q680)

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DLMF:1.17.E21
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    δ ( x - a ) = 1 2 π k = - e i k ( x - a ) . Dirac-delta 𝑥 𝑎 1 2 𝜋 superscript subscript 𝑘 superscript 𝑒 𝑖 𝑘 𝑥 𝑎 {\displaystyle{\displaystyle\delta\left(x-a\right)=\frac{1}{2\pi}\sum_{k=-% \infty}^{\infty}e^{ik(x-a)}.}}
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