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## Main Question or Discussion Point

**[SOLVED] Evaluate the Klein-Gordon action**

I'm interested in evaluating the Klein-Gordon action in P&S, p. 287. It goes as follows

[tex]

S_0 = \frac{1}{2} \int d^4 x \! \phi \left( - \partial^2 -m^2 \right) \phi + \left(\text{surface term} \right)

[/tex]

The surface terms drops out, that's fine. I would like to see a detailed calculation of the first part of the integral. Anyone to the rescue?

Thanks in advance!