Distinct space-time points have different pasts and futures {space-time point set}. Because maximum speed is light speed, space-time points have possible past points {past-set} and possible future points {future-set}. Point past-sets and future-sets are unique {indecomposable}. Indecomposable past-sets can affect the space-time point. The space-time point can affect indecomposable future-sets.
Geometries can have points at infinity (ideal point). Space-time should not have ideal points or singularities.
Physical Sciences>Physics>Relativity>Space-Time
5-Physics-Relativity-Space-Time
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Date Modified: 2022.0224