Space paths must not reverse time, so nothing can happen at two times. Between a past point and future points reachable from the past point, along geodesic, all space-time points must be reachable {hyperbolicity} {hyperbolic space-time, relativity}. If geodesics exist, space-time has no singularity.
Physical Sciences>Physics>Relativity>General Relativity>Time
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Date Modified: 2022.0224