PJK
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Hi all,
I have a question regarding p.97 of Peskin Schroeder and its explantion of disconnected diagram exponentation. I do understand the formula on the buttom of page 96. \prod{\frac{1}{n_i!}V_{i}^{n_i}} \cdot (value \; of\; connected \; piece)
ButI do not understand the sum over \{ n_i \} in the next step!
I would think that I have to sum over the values of all diagrams. Each value is given by the formula which I understand. But why are there two sums?
I have a question regarding p.97 of Peskin Schroeder and its explantion of disconnected diagram exponentation. I do understand the formula on the buttom of page 96. \prod{\frac{1}{n_i!}V_{i}^{n_i}} \cdot (value \; of\; connected \; piece)
ButI do not understand the sum over \{ n_i \} in the next step!
I would think that I have to sum over the values of all diagrams. Each value is given by the formula which I understand. But why are there two sums?