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An exactly soluble model of the renormalization group for two-dimensional quantum electrodynamics is presented. The theory has a nontrivial eigenvalue at which it is scale-invariant and some operators acquire anomalous dimensions. The anomalous constant associated with the axial-vector current is independent of the coupling constant away from the eigenvalue, but vanishes at the eigenvalue.
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Crewther et al. (1973) studied this question.
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