- #1
PJK
- 15
- 0
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. [tex]\prod{\frac{1}{n_i!}V_{i}^{n_i}} \cdot (value \; of\; connected \; piece)[/tex]
ButI do not understand the sum over [tex] \{ n_i \}[/tex] 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. [tex]\prod{\frac{1}{n_i!}V_{i}^{n_i}} \cdot (value \; of\; connected \; piece)[/tex]
ButI do not understand the sum over [tex] \{ n_i \}[/tex] 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?