Lorentzian metrics from characteristic surfaces

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Abstract
The following issue is raised and discussed; when do families of foliations by hypersurfaces on a given four dimensional manifold become the null surfaces of some unknown, but to be determined, metric $g_{ab}(x)$? It follows from these results that one can use these surfaces as fundamental variables for GR.Comment: 14 pages, tarred, compressed and uuencode RTF fil

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