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Regarding the Pauli principle in quantum field theory and in many-bodyquantum mechanics, Feynman advocated that Pauli's exclusion principle can becompletely ignored in intermediate states of perturbation theory. He observedthat all virtual processes (of the same order) that violate the Pauli principlecancel out. Feynman accordingly introduced a prescription, which is todisregard the Pauli principle in all intermediate processes. This ingeneoustrick is of crucial importance in the Feynman diagram technique. We show,however, an example in which Feynman's prescription fails. This casts doubts onthe general validity of Feynman's prescription

Validity of Feynman’s prescription of disregarding the Pauli principle in intermediate states