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Feynman diagram

A Feynman diagram is a pictorial representation of the mathematical expressions describing the behavior of subatomic particles.



There are a number of rules you should follow to draw a clear diagram.

A horizontal or vertical time axis is often shown, but this is actually unnecessary. The Swiss mathematician Ernst Stückelberg showed as early as 1941 that antiparticles have an opposite charge, and run backwards in time.



The American physicist Richard Feynman invented these diagrams in 1948.

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