Einstein’s Field Equation for General Relativity
(Regarding the 100th anniversary of Albert Einstein’s presentation of the complete “Theory of General Relativity” to the Prussian Academy)
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matter tells spacetime to curve
spacetime tells matter to move
gravity tells light to swerve
as Mercury’s sphere was to prove
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“Asked in 1919 whether it was true that only three people in the world understood the theory of general relativity, Eddington replied: ‘Who’s the third?”
― Arthur Stanley Eddington
Poesy plus Polemics 