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A. Zee, Quantum Field Theory in a Nutshell
· Problem N.2.5
Field Theory Redux
Physics — QFT
Problem
Why doesn't the argument in the text that
A
(
−
+
+
⋯
+
+
)
A(- + + \cdots + +)
A
(
−
+
+
⋯
+
+
)
vanish apply to
A
(
−
+
+
)
A(- + +)
A
(
−
+
+
)
?
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