Perturbative and global anomalies in supergravity theories
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Perturbative and global anomalies in supergravity theories are reviewed. The existence of a matter and gauge coupled supergravity theory in six dimensions with E6E7U(1) symmetry and highly nontrivial anomaly cancellations is emphasised. The possible string origin of this theory is posed as an open problem, study of which may lead to discovery of new ways to construct/compactify heterotic superstrings. 1987 ACADEMIA, Publishing House of the Czechoslovak Academy of Sciences.