*John L. Synge:<ref name="Capria">{{cite book |author=Marco M. Capria, Aubert Daigneaut et al. |title=Physics Before and After Einstein |publisher=IOS Press |year=2005 |chapter=5. General Relativity: Gravitation as Geometry and the Machian Programme |pages=97, 114|isbn=1-58603-462-6 |url=http://www.dmi.unipg.it/~mamone/pubb/PBAE.pdf |quote=John L. Synge, who was the author of one of the classic reference books on relativity [101], wrote half a century after Einstein’s first formulation of general relativity: [...] when one examines some proofs in the Neo-cartesian spirit, too often they seem to dissolve completely away, leaving one in a state of wonder as to whether the author really thought he had proved something. Or is the reader stupid? It is hard to say. In any case I am still waiting for a rational treatment of the dynamics of the solar system according to Einstein’s theory [100, p. 14].}}</ref> | *John L. Synge:<ref name="Capria">{{cite book |author=Marco M. Capria, Aubert Daigneaut et al. |title=Physics Before and After Einstein |publisher=IOS Press |year=2005 |chapter=5. General Relativity: Gravitation as Geometry and the Machian Programme |pages=97, 114|isbn=1-58603-462-6 |url=http://www.dmi.unipg.it/~mamone/pubb/PBAE.pdf |quote=John L. Synge, who was the author of one of the classic reference books on relativity [101], wrote half a century after Einstein’s first formulation of general relativity: [...] when one examines some proofs in the Neo-cartesian spirit, too often they seem to dissolve completely away, leaving one in a state of wonder as to whether the author really thought he had proved something. Or is the reader stupid? It is hard to say. In any case I am still waiting for a rational treatment of the dynamics of the solar system according to Einstein’s theory [100, p. 14].}}</ref> |