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As I pointed out in another message it is quite simple to produce a
gravitational field which either converges or diverges, or else is
homogeneous to any hypothetical degree one specifies, over a volume
as large as one wishes, within reason. ...
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The point of Einstein's principle of equivalence is that within the
region over which the field can be considered to be uniform, there
is *no observable difference* between phenomena which might be
attributed to a gravitational force originating outside the frame
and phenomena attributable to an inertial force due to a uniform
acceleration of the frame. ...
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A difference, to be a difference, must make a difference. (I've
also forgotten the attribution for this sage observation.)
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