What are the key concepts in Srednicki's explanation of Feynman diagrams in QFT?

In summary, Srednicki is discussing how Feynman diagrams can simplify complex math problems. There are a certain number of diagrams that result from rearranging the vertices and sources, and these diagrams have the same symmetry factors. However, he argues that there is a better way to find the number of combinations for one diagram. This method is by multiplying all counting factors.
  • #36
Great find, RedX!

Glad to know that you like the book, too.

I'm very soon entering the chapters on renormalization. Even though I try to take Srednicki's advice 'reading passages you don't get four times' more to heart, I will surely turn to physics forums for some more help.
 

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