- #1

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[tex] lnA= \frac{d^{n}}{ds^{n}} \frac{s^{n-1}}{n! A^{s}} [/tex]

my question is .. where does this formula come from ??

here 'n' is supposed to be a finite parameter we must define to avoid the divergences, is it valid for non-renormalizable or renormalizable theories ??