What Do the Commutators in Peskin and Schroeder's Equation (2.30) Represent?

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The discussion focuses on the interpretation of the two commutators in Peskin and Schroeder's Equation (2.30), which are identified as Dirac delta functions. Specifically, the first commutator is -δ(p' + p) and the second is δ(p + p'). The subtraction of these terms results in the cancellation of the negative sign and the factor of 2 in Equation (2.30). The integral identity used to derive the final result is ∫δ(p + p′) F(p′) dp′ = F(-p).

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Can someone tell me what the two commutators in (2.30) stand for? It has to be Dirac delta functions, but which one exactly?

thank you
 
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Acording to (2.29) the first one should be - \delta(p' + p) and the second \delta(p + p'). After substracting both the negative sign as well as the factor 2 cancel in (2.30). I guess you should then make use of:

\int \delta(p + p^{\prime}) F(p^{\prime}) dp^{\prime} = F(- p)

to obtain the final result in (2.30).
 
Thanks hellfire
 

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