I am studing QFT using the text book of Srednicki's. And I am stuck on one of calculations of the integrals in his book.
What does he mean by passing to the lagrangian formulation? And how did he calculate the $Dp$ part?
It's on page 46 of the book: http://chaosbook.org/FieldTheory/extras/SrednickiQFT03.pdf