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seen Dec 16 '12 at 8:44

Dec
15
comment Scalar Field Theory Decay/Scattering
OK, thanks for answering.
Dec
15
comment Scalar Field Theory Decay/Scattering
Oh, now I recall the keyword: "Topologically inequivalent diagrams". So for instance the diagram of $\phi\phi^\dagger\rightarrow\chi$ can be viewed as (if one rotates the diagram) $\phi\rightarrow\phi\chi$ (like you said?).