Abstract
It is demonstrated that a compact space and time-orientable space-time is cobordant in the unoriented sense, that is, bounds a compact five-manifold. The bounding property is a direct consequence of the triviality of the Euler number.
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Whiston, G.S. ‘Hyperspace’ (the cobordism theory of space-time). Int J Theor Phys 11, 285–288 (1974). https://doi.org/10.1007/BF01808083
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DOI: https://doi.org/10.1007/BF01808083