In the Feynman lectures on physics Vol.III (P.3-4), Feynman gives an equation for the amplitude for a free particle of definite energy to go from(adsbygoogle = window.adsbygoogle || []).push({}); rto_{1}rto be proportional to_{2}

[itex]\dfrac{e^{ip\cdot r_{12}/\hbar}}{r_{12}}.[/itex]

Where does this equation come from, especially the r_{12}in the denominator?

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# Amplitude to go from a location to another

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