I'm having a bit of trouble working through the induction proof they give in the book.(adsbygoogle = window.adsbygoogle || []).push({});

The step I don't understand is: (page 90 in the book, halfway down)

[tex] N(\phi_2...\phi_m)\phi_1^+ + [\phi_1^+,N(\phi_2...\phi_m)] = N(\phi_1^+\phi_2...\phi_m) + N([\phi_1^+,\phi_2^-]\phi_3...\phi_m + \phi_2[\phi_1^+,\phi_3^-]\phi_4...\phi_m + ...) [/tex]

I've gone through the m=2 case in the book, and I did m=3 myself. But I just can't see how they get between the two lines above, even though I've convinced myself it should work.

If someone could explain it's be great, thanks.

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# Wick's Theorem Proof (Peskins and Schroder)

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