The invariant interval is a fundamental quantity in the theory of relativity that measures the separation between two events in spacetime, remaining constant for all observers regardless of their relative motion. This interval combines both spatial and temporal distances, encapsulated in the formula $$s^2 = c^2 t^2 - x^2$$, ensuring that it retains the same value in all inertial frames. The concept is crucial for understanding relativistic effects and underpins many key principles in modern physics.
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