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Various renormalization-type approaches to the Kondo problem are shown to be equivalent. It is pointed out that the exact solution to the ferromagnetic case has been known for many years in quantum field theory. For the antiferromagnetic case, in the infrared limit the effective coupling becomes infinite, and there is no "critical-exponent" behavior at zero energy. Some recent criticisms of Anderson scaling laws are discussed.
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Michael Fowler (1972) studied this question.
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