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<p>first published in 1916. Just as <a href="page.php?w=Galilean_invariance">Galilean relativity</a> is accepted as an approximation of special relativity that is valid for low speeds, special relativity is considered an approximation of general relativity that is valid for weak <a href="page.php?w=gravitational_field">gravitational field</a>s, that is, at a sufficiently small scale (e.g., when <a href="page.php?w=tidal_force">tidal force</a>s are negligible) and in conditions of <a href="page.php?w=free_fall">free fall</a>. But general relativity</p><p>
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