I really got great help from Grok, which make my formula from my initial S(f_1-f_2)=-GMm(1/r1_-1/r_2) to Sm(f_1-f_2)=mc^2{[1-2GM/(c^2*r_1)]^(1/2)-[1-2GM/(c^2*r_2)]^(1/2)}. Grok helped me done in two consective steps…
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