Arthur Geoffrey Walker
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Arthur Geoffrey Walker (17 July 1909 - 31 March 2001) was a leading mathematician who made important contributions to physics and physical cosmology. He was born in Watford, Hertfordshire, England.
Walker was an accomplished geometer, but he is best remembered today for two important contributions to general relativity. Together with H. P. Robertson, the well known Robertson-Walker metric for the FRW cosmological models, which are exact solutions of the Einstein field equation. Together with Enrico Fermi, he introduced the notion of Fermi-Walker differentiation.