Abstract
IT was in January 1914 that/Einstein (Zeits. f. Math. u. Phys., 63, P. 215; 1914) made his great departure, from tfte Newtonian doctrine of gravitation by abandoning the idea that the gravitational potential is scalar. The thirteen eventful years which have passed since then have seen the rapid development of the new theory, which is called General Relativity, and the confirmation by astronomers and astrophysicists of its predictions regarding the bending of light-rays by the sun and the displacement of spectral lines. At the same time a number of new problems have arisen in connexion with it; and perhaps the time has now come to review the whole situation and to indicate where there is need for further investigation.
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WHITTAKER, E. The Outstanding Problems of Relativity1. Nature 120, 368–371 (1927). https://doi.org/10.1038/120368a0
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DOI: https://doi.org/10.1038/120368a0