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It is not that I am looking for a cheap way out of reading a book about RG flow, but I would like to know few key insights that RG flow study provides, backed with some specific examples. I know a little about scaling and concept of renormalization.

So, to be specific, if I have a system in hand, how will I know that using RG flow (correct me if I'm using it all wrong) will give me some deeper insight?

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