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The co~lformal trace anomalies for massless scalar, "neutrino," and photon fields propagating in an arbitrary Riemannian space-time are derived. They are seen to be a consequence of the subtraction, during renormalization, of a finite term, -In(m 2L 2j, which violates the scale invariance of the massless theory.A general derivation of the scalar anomaly is given based on the (-function regularization developed earlier.

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