Causally oriented manifolds and groups. (English) Zbl 0242.53009


53A30 Conformal differential geometry (MSC2010)
53C50 Global differential geometry of Lorentz manifolds, manifolds with indefinite metrics
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[1] J. Leray, Hyperbolic partial differential equations, Institute for Advanced Study, Princeton, N. J. (mimeographed notes).
[2] O. Veblen, et al., Geometry of complex domains, Institute for Advanced Study, Princeton, N. J. (mimeographed notes).
[3] Irving Segal, Positive-energy particle models with mass splitting, Proc. Nat. Acad. Sci. U.S.A. 57 (1967), 194 – 197.
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