Intrinsic Uncertainty of Reference Frames

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PHYSICAL ideas which seem at first sight somewhat arbitrary become, as Eddington has stressed, almost inevitable when the relativity principle is taken to its proper conclusion. As examples may be quoted the law of gravitation, in which the radius of curvature anywhere in the universe is proportional to the corresponding amount of matter there, and the principle of unit weights (equal a priori probabilities) in statistical mechanics.

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  1. 1

    NATURE, 137, 313 (1936).

  2. 2

    cf. Edmondson, NATURE, 133, 759 (1934).

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