Abstract
IN his letter in NATURE of November 25, replying to mine which appeared in NATURE of October 28, Prof. Piaggio points out that the equations of Space-Time geodesics may be deduced by other methods than those of the calculus of variations, and suggests that, in some such way, it is possible to get over the difficulties to which I directed attention.
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ROBB, A. Space-Time Geodesics. Nature 110, 809–810 (1922). https://doi.org/10.1038/110809b0
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DOI: https://doi.org/10.1038/110809b0
