Abstract
It is shown that Schmidt'sb-boundary for a spacetime can be analyzed using a submanifold of the tangent bundle, rather than the principal bundle or the bundle of orthogonal frames.
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References
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Sachs, R.K. Spacetimeb-boundaries. Commun.Math. Phys. 33, 215–220 (1973). https://doi.org/10.1007/BF01667918
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DOI: https://doi.org/10.1007/BF01667918