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I confess, I didn't make much googling about this, so if this question is

already answered :) just show me the link to answer...

In his famous video lectures about quantum electro dynamics,

Richard Feynman is talking about electron and photon functions

E and P. And whole story is about path-integrating those functions.

In wikipedia it is as follows:

In Feynman's lectures, he says P is related to ( 1 / ( (t^2) - (x^2) ) )If a photon moves from one place and time – in shorthand, A – to another place and time – shorthand, B – the associated quantity is written in Feynman's shorthand as P(A to B). The similar quantity for an electron moving from C to D is written E(C to D).

( minus; reminding of relativity )

What exactly are those E and P functions? ( formula? )

Thanks.