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{{short description|British mathematician}}
'''Arthur Geoffrey Walker''' (17 July 1909 – 31 March 2001)<ref>{{Cite journal | last1 = Hitchin | first1 = N. J. | doi = 10.1098/rsbm.2006.0028 | title = Arthur Geoffrey Walker. 17 July 1909 -- 31 March 2001: Elected FRS 1955 | journal = [[Biographical Memoirs of Fellows of the Royal Society]] | volume = 52 | pages = 413–421 | year = 2006 | pmid = | pmc = }}</ref><ref name="TimesObit">{{cite web |url=http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Walker_Arthur.html |title=Walker_Arthur summary |work= |accessdate=2011-07-21}}</ref> was a leading [[mathematician]] who made important contributions to [[physics]] and [[physical cosmology]]. Although he was an accomplished [[differential geometry|geometer]], 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]].▼
{{Use dmy dates|date=January 2018}}
{{Use British English|date=January 2018}}
{{infobox person
|birth_date = {{birth date|1909|7|17|df=y}}
|birth_place = [[Watford]], [[Hertfordshire]], England
|alma_mater = [[Balliol College, Oxford]]<br>[[Merton College, Oxford]]<br>[[University of Edinburgh]]
|occupation = Mathematician, math professor
|death_date = {{death date and age|2001|3|31|1909|7|17|df=y}}
|spouse = Phyllis Ashcroft Freeman (m. 1939)
}}
▲Prof '''Arthur Geoffrey Walker''' [[Royal Society of London|FRS]] [[FRSE]] (17 July 1909
Together with [[Howard Percy Robertson|H. P. Robertson]], they devised the well-known [[Robertson–Walker metric|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]].
==Early life==
He was born in [[Watford]] on 17 July 1909 the son of Arthur John Walker (b.1879), a coach builder, and his wife, Eleanor Joanna Gosling.<ref name="MacTutor"/>
Walker attended [[Watford Grammar School for Boys]] and won a scholarship to [[Balliol College, Oxford]], where he graduated with first class honours.<ref name="MCreg">{{cite book|editor1-last=Levens|editor1-first=R.G.C.|title=Merton College Register 1900-1964|date=1964|publisher=[[Basil Blackwell]]|location=Oxford|page=232}}</ref> He then studied at [[Merton College, Oxford]] and completed his doctorate at the [[University of Edinburgh]].<ref name=MCreg /><ref>{{cite web | title = A. G. Walker| publisher = [[The Times]]| year = 2001| url = http://www-groups.dcs.st-and.ac.uk/~history/Obits/Walker_Arthur.html | accessdate =2008-10-13 }}</ref>▼
▲Walker attended [[Watford Grammar School for Boys]] and won a scholarship to [[Balliol College, Oxford]], where he graduated with first class honours in Mathematics.<ref name="MCreg">{{cite book|editor1-last=Levens|editor1-first=R.G.C.|title=Merton College Register 1900-1964|date=1964|publisher=[[Basil Blackwell]]|location=Oxford|page=232}}</ref> He then studied at [[Merton College, Oxford]].
==Academic career==
Walker took up a post as Lecturer at [[Imperial College]] in 1935; the following year he was appointed as Lecturer in Pure Mathematics at the [[University of Liverpool]], a post he held until 1947, when he moved to the [[University of Sheffield]] as Professor of Pure Mathematics.<ref name=
In 1946 he was elected a Fellow of the [[Royal Society of Edinburgh]]. His proposers were [[Harold Stanley Ruse]], Sir [[Edmund Taylor Whittaker]], [[David Gibb (mathematician)|David Gibb]] and [[William Edge (mathematician)|William Edge]]. He won the Society's [[Keith Medal]] for the period 1947/49.<ref name = KM/> In 1952 he returned to Liverpool University, in 1962 becoming Dean of its Faculty of Science.<ref name=MCreg /> Having been elected a Fellow of the [[Royal Society]] in 1955, he served as a member of the organisation's council from 1961 ==Publications==
*''Harmonic Spaces'' (1962)
*''An Introduction to Geometrical Cosmology'' (1975)
==Awards and honours==
*Fellow of the [[Royal Astronomical Society]], 1934<ref name=MCreg />
*Fellow of the [[Royal Society of Edinburgh]], 1946<ref name = KM>{{cite book|url=http://www.royalsoced.org.uk/cms/files/fellows/biographical_index/fells_indexp2.pdf|title=Former Fellows of the Royal Society of Edinburgh 1783–2002|publisher=[[Royal Society of Edinburgh]]|date=July 2006|page=959|isbn=0-902-198-84-X|access-date=27 November 2014|archive-url=https://web.archive.org/web/20140116140212/http://www.royalsoced.org.uk/cms/files/fellows/biographical_index/fells_indexp2.pdf|archive-date=16 January 2014|url-status=dead}}</ref>
*[[Berwick Prize]], 1947<ref name=
*[[Keith Medal]], 1947-9<ref
*Fellow of the [[Royal Society]], 1955<ref name=
==Personal life==
Walker married Phyllis Ashcroft Freeman in 1939;<ref name=MCreg /> the couple were accomplished ballroom dancers.<ref name=
==References==
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==External links==
*{{cite web |title=Arthur Geoffrey Walker |first1=J J |last1=O'Connor |first2=E F |last2=Robertson|url=
*{{cite web |title=Arthur Geoffrey Walker |url=http://www.genealogy.math.ndsu.nodak.edu/id.php?id=143411 |publisher=Mathematical Genealogy Project; North Dakota State University |
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