Quote: all electrical and light phenomena arise from photons and electrons moving from place to place and from electrons emitting and absorbing photons
So now, I present to you the three … goes from place to place. --Action #2: An … of these actions has [a probability] amplitude--an arrow-- that … [The probability of a particular event depends on all of the ways that that event could have happened.]
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Quote: each event in quantum electrodynamics has a probability amplitude; compute from the ways the event could have happened