Fama, C.J. and Clarke, C.J.S.
A rigidity result on the ideal boundary structure of smooth spacetimes
Classical and Quantum Gravity, 15, . (doi:10.1088/0264-9381/15/9/027).
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Following a survey of the abstract boundary definition of Scott and Szekeres, a rigidity result is proved for the smooth case, showing that the topological structure of the regular part of this boundary in defined invariantly.
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