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'''Arthur Geoffrey Walker''' (17 July 1909 – 31 March 2001)<ref>{{Cite journal | last1 = Hitchin | first1 = N. J. | doi = 10.1098/rsbm.2006.0028 | title =
Walker was an accomplished [[differential geometry|geometer]], but he is best remembered today for two important contributions to [[general relativity]]. Together with [[Howard Percy Robertson|H. P. Robertson]], the well known [[Robertson–Walker metric]] for the [[Friedmann–Lemaître–Robertson–Walker]] cosmological models, which are [[exact solutions in general relativity|exact solutions]] of the Einstein field equation. Together with [[Enrico Fermi]], he introduced the notion of [[Fermi–Walker differentiation]].
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