Events occurring at the same time and space are simultaneous contact events.
These contact points cannot be associated with a coordinate system since the vector sum of all possible contact forces is identically zero. However, technically, the events are all at rest and there is no sequence of temporal order. As stated elsewhere, a force free environment is also a coordinate free environment. This is the same as the rest frame of simultaneous events in Einstein’s special relativity forming a mass free universe which is fundamentally inertia free and interactionless analogous to the true vacuum.


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