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We show that the N=1 supergravity theories in ten dimensions with gauge groups U (1) 496 and E8×U (1) 248 are not consistent quantum theories. Cancellation of anomalies cannot be made compatible with supersymmetry and Abelian gauge invariance. Thus, in ten dimensions all supersymmetric theories of gravity without known inconsistencies are realized in string theory.
Adams et al. (Tue,) studied this question.