surfing the web and arxiv i found the strange formula(adsbygoogle = window.adsbygoogle || []).push({});

[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 ??

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# Strange definition of regularization of Operators

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