- #1

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## Homework Statement

Hi,

I am looking at the attached question, parts a) and b).

## Homework Equations

## The Attempt at a Solution

so for part a) it vanishes because in the ##lim \epsilon \to 0 ## we have a complete derivative:

## \int d\phi \frac{d}{d\phi} (Z[J]) ##

for part b) we attain part a) which we have just shown vanishes by taking the derivatives inside the integral, however, for this to be a complete derivative again we also need that ##lim \epsilon \to 0 ## don't we? but part b) imposes no condition on ##\epsilon## so isn't it asking us to show that this holds for any ##\epsilon## how would we do this instead?