I came across this quote recently:(adsbygoogle = window.adsbygoogle || []).push({});

"The general theory of relativity teaches that the inertial mass of a given body is greater as there are more ponderable masses in proximity to it; thus it seems very natural to reduce the total inertia of a body to interactions between it and the other bodies in the universe, as indeed, ever since Newton's time, gravity has been completely reduced to interaction between bodies. The results of calculation indicate that the universe would necessarily be spherical. (Einstein, 1954)"

Did Einstein really say this, and if so, is there a quantative connection between nearby matter and the inertial reactance of an accelerated mass predicted by GR?

Is there any experimental validation?

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# Inertial dependence upon local matter

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