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 r1 to r2 to be proportional to
[itex]\dfrac{e^{ip\cdot r_{12}/\hbar}}{r_{12}}.[/itex]
Where does this equation come from, especially the r12 in the denominator?
[itex]\dfrac{e^{ip\cdot r_{12}/\hbar}}{r_{12}}.[/itex]
Where does this equation come from, especially the r12 in the denominator?
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