A. Zee, Quantum Field Theory in a Nutshell · Problem N.2.3

Field Theory Redux

Physics — QFT

Problem

Show that the result in (17) satisfies the reflection identity A(1−,2−,3+,4+)=A(4+,3+,2−,1−)A(1^-, 2^-, 3^+, 4^+) = A(4^+, 3^+, 2^-, 1^-).

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