A rigidity result on the ideal boundary structure of smooth space-times
C. J. Fama, C. J. S. Clarke

TL;DR
This paper proves a rigidity theorem for the ideal boundary structure of smooth space-times, demonstrating that the topological structure of the regular boundary part is invariantly defined.
Contribution
It establishes a rigidity result for the ideal boundary in smooth space-times, confirming its topological invariance.
Findings
Rigidity of the ideal boundary structure in smooth space-times
Topological invariance of the regular boundary part
Clarification of boundary structure properties
Abstract
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 invariantly defined.
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