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feynman diagram

 
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Jan19-05, 01:26 AM   #1
 

feynman diagram


Is there a systematical way to count all the possible feynman diagram with vertices less than or equal to n......
 
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Jan19-05, 01:37 AM   #2
 
one more question.... see the attachment.... are these two feynman diagram the same?
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Jan19-05, 06:04 AM   #3
 
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They're not.There are the 2 (distinct) contributions to the Compton scattering of electrons (if i saw well,or positrons in the other case).

To the first question:nope,in general u cannot tell how many distinct Feynman diagrams a QFT has in a certain order.U have to compute all possible unconnected Green functions,using the approximation for the generating functional.

Daniel.
 
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