Can you please tell me how to(adsbygoogle = window.adsbygoogle || []).push({}); integrate by parts the d'alembertian of a 4-variable functionover a volume dx * dy * dz * dt. I have stumbled upon this seemnigly simple exercise on my way to understanding QFT of scalar fields.

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# Integrate by parts the d'alembertian of a 4-variable function

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