Null strings and Bianchi identities

Abstract
The results of the theory of complexified V4’s which admit a null string are reexamined by using systematically the Bianchi identities. The formal reasons which permit the integration of the Gμν=0 equations to one differential constraint in the case of the ℋℋ structures are exhibited. Some new results concerning complexified Einstein–Weyl equations in the presence of a null string are given as well.

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