We shall therefore assume the complete physical equivalence of a gravitational field and a corresponding acceleration of the reference system.

Summary

This quote expresses the principle of equivalence put forward by Albert Einstein in his theory of general relativity. It states that a gravitational field is indistinguishable from an accelerated frame of reference. In other words, the effects of gravity can be viewed as the result of being in a reference system undergoing acceleration rather than being in an actual gravitational field. This principle was a fundamental component in Einstein's understanding of gravity and its effects on space, time, and matter.

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