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This seems to be resolved in most modern literature and textbooks. Everywhere I look I see horizontal (left -> right) diagrams.
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While P&S is nice, I guess I had different textbooks in mind: * https://schwartzqft.fas.harvard.edu/ * http://web.physics.ucsb.edu/~mark/qft.html * http://www.damtp.cam.ac.uk/user/tong/qft.html … Weinberg seems to use bottom-top diagrams just as P&S so apparently the habits broke around 2000’s
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You are totally right, though. I've overlooked the fact that P&S did it.
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