1. 'Proper time' including 'relative time' is not natural or the event itself but an emerging concept, mathematical in character.
2. 'Space' is not natural or eventual itself but a three- dimensional extent as a mathematical concept.
3. Whether 'spacetime,' which combines three-dimensional Euclidean space and fourth- dimensional time into a four-dimensional manifold, is not natural, nor eventual itself, nor dependent on relativistic effects but a four-dimensional extent as a mathematical concept.
4. Whether time is not distorted due to relativistic effects.
#time #propertime #space #spacetime #concepts #event
