Abstract
The equivalence theorem in quantum field theory is proven on the basis of the field-antifield formalism. It is shown that the equivalence theorem does not contradict the well-known fact that, in quantum theory, some symmetries of the classical action functional are broken (anomalous). By way of example, a model is considered where natural finite counterterms can be chosen in different ways leading to physically nonequivalent quantum theories, but where the equivalence theorem remains valid.
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