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Weak equivalence or principle of uniqueness of freefall

Weak equivalence principle: principle of uniqueness of freefall: The idea in general relativity is that the world-line of a freefalling body is sovereign of its composition, structure, or state. This principle, hold by Newtonian mechanics and gravitation whenever Newton set the inertial and gravitational masses equivalent to each other. This principle is included into a stronger version with the correspondence principle.

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