"A geodesic that is not a null geodesic has the property that ∫ds, taken along a section of the track with the end points P and Q, is stationary if one makes a small variation of the track keeping the end points fixed."
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Original Language: English
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Sources
P. A. M. Dirac, (1st edition, 1975)
https://en.wikiquote.org/wiki/Geodesic
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Geodesic
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