My book loves to represent the delta function as:(adsbygoogle = window.adsbygoogle || []).push({});

δ(r-r')=∫_{-∞}^{∞}exp(i(r-r')k)dk

Now I can understand this formula if the integration was over the unit circle since. But this is an integration for which the antiderivative as no meaningful limit as x->±∞

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# Delta function

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