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Whats is the actual motivation for necesity of renormalization group?

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Normalisation should come first.

What is so suspicious about the motivation that you need an "actual motivation"?

Isn't the fact that physical parameters should be expected to depend on the length/energy scale at which you observe them enough motivation?

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  • 2 weeks later...

I don't know the mathematical motivation.
The Physical motivation is the elimination of divergences in the perturbative corrections of Quantum Field Theory.

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