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We show how the one-loop "poor man's scaling" equations for the Kondo modelwith arbitrary impurity spin can be obtained within the framework of thefunctional renormalization group approach for quantum spin systems recentlydeveloped by Krieg and Kopietz [arXiv:1807.02524]. We argue that our methodsupersedes the "poor man's scaling" approach and can also be used to study thestrong coupling regime of the Kondo model.

A rich man's derivation of scaling laws for the Kondo model