= Strong equivalence principle
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= Strong principle of equivalence
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The strong <equivalence principle> extends universality of free fall to bodies with appreciable gravitational self-energy and requires local experiments, including gravitational ones, in a freely falling laboratory to be independent of the laboratory's location and velocity. This statement neglects external tidal variation across the laboratory; it does not remove <Riemann curvature tensor>. In <general relativity>, universal metric coupling, fixed local gravitational coupling and the absence of extra preferred-frame gravitational fields implement this principle.
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