Feyman Diagram - Represent QED model(s)?

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Simone_beet
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Hello - Trying the General Physics area. Question: Please explain how a Feyman Diagram represents or is conceived from a QED Model(s) i.e. IF it is the source of these diagrams? What is meant to be represented in them? Thank you
 

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These are two sites that give good descriptions of what Feynman diagrams are. The latter is a bit more in depth:
http://www.physlink.com/Education/askexperts/ae263.cfm"
http://en.wikipedia.org/wiki/Feynman_diagram"

Also, here are some great videos where Feynman himself teaches QED. He describes the diagrams in the 3rd video:
http://www.vega.org.uk/video/subseries/8"
 
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