Null-infinity Definition

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.

Wiktionary

Other Word Forms of Null-infinity

Noun

Singular:

null-infinity

Plural:

null-infinities

Origin of Null-infinity

From the physics concept of "at infinity" or "far", where fields are small, and the math concept of null set. Ironically, a null infinity may be neither far nor a null set.

From Wiktionary