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Jun23-04, 12:12 AM
“Already before a period of one year, A. Einstein, by accepting an influence of the gravitation potential on the speed of light, gave up the postulate of the constant speed of light essential for his earlier theory 1); in a work appeared recently 2)......”
So, the famous “constancy” postulate of the 1905 SR theory did not exist after 1912, and it doesn’t exist today.
Well you got me there; I don't know much about GR.
But, I thought speed of light is measured constant even under the influence of gravity.
Are you sure these aren't out-dated historical records?
What do you say about that 1920 book?