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Full Idea
Einstein's General Theory arose from the idea that there is no absolute measure of force and acceleration.
Gist of Idea
General Relativity says there is no absolute force or acceleration
Source
report of Albert Einstein (works [1915]) by Frank Close - Theories of Everything 5 'Gravity'
Book Ref
Close,Frank: 'Theories of Everything' [Profile Books 2017], p.91
A Reaction
If absolutely everything is only true relative to something else you wonder what the point of measuring anything is. How big can a 'frame of reference' or 'inertial frame' be. Is the multiverse a frame of reference?
Related Idea
Idea 20622 All motions are relative and ambiguous, but acceleration is the same in all inertial frames [Close]