There are multiple notions of relativity and relativistic universe, depending upon which notion of universe is being used.
In mathematics and logic, for relativity in the sense of a relativistic type universe:
In physics, for relativity in the sense of a universe whose spacetime is relativistic spacetime:
Last revised on July 2, 2025 at 17:44:12. See the history of this page for a list of all contributions to it.