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Reference15 articles.
1. J. Krause:Nuovo Cimento,18 B, 302 (1973);Journ. Math. Phys.,16 1090 (1975); hereafter referred to as papers I and II, respectively.
2. A. Friedman:Journ. Math. Mech.,10, 625 (1961).
3. The present comunication is a report of work in progress; it contains some partial results concerning the structure of the Einstein tensor, as revealed by the embedding probe, which commend themselves, and which may eventually pan out into something interesting for physics.
4. L. P. Eisenhart:Riemannian Geometry (Princeton, N. J., 1926), p. 149.
5. Class-1 manifolds clearly afford the simplest embedding scheme to begin with. Moreover, the cosmological interest of class-1 locally embedded relativistic manifolds is well known; cf.J. Rosen:Rev. Mod. Phys.,37, 204 (1965).