.. Absolute time would exist in a causal structure for which the concept indeterminate as to time order lends to a unique simultaneity, i.e., for which there is no finite interval of time between the departure and return of a first-signal..
Hans Reichenbach
order thetimes time
For the Lorentz transformation spatial measurements are also changed, because they are obtained relative to a moving system. In our example only time was transformed, while the distances between points at rest remained the same; the spatial coordinates, therefore, retain their identity.
example distance thetimes time rest system
This fact.. Proves that space measurements are reducible to time measurements. Time is therefore logically prior to space.
thetimes time
Light signals alone provide the metrical structure of the four-dimensional space-time continuum. The construction may be called light axioms.
thetimes time light
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