File:Feynman'sDiagram.jpg

Picture of a Feynman diagram, inscribed by Richard P. Feynman to me, in my copy of Volume 3 of his Feynman Lectures on Physics (Quantum Mechanics). Picture taken by self.

if you can't read the symbols, they are ${\displaystyle \gamma _{\mu }}$ to ${\displaystyle \gamma _{\mu }}$ and ${\displaystyle 1/q^{2}}$

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