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Definition of Null infinity
1. Noun. In a closed space-time, especially for an Einstein cylinder, null infinity for a given point is the limit of convergence of the light cone most distant from the given point. That is, it is the limit of a set of points that each have a time-like separation from every point that has a space-like separation from the given point. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Null Infinity
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