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David Singmaster
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{{Short description|British mathematician (1938β2023)}} {{Use dmy dates|date=April 2022}} {{Infobox scientist | honorific_prefix = | name = David Singmaster | image = David Singmaster 2006.jpg | image_size = 240px | caption = Singmaster in 2006 | birth_date = {{birth date|1938|12|14|df=y}}<ref name="g4g2018b">{{cite interview |last=Singmaster |first=David |subject= |subject-link= |interviewer=[[Dana S. Richards]] |title=An Extended Interview with David Singmaster |type= |url=https://www.youtube.com/watch?v=7ZolXFbWkRM&t=20m15s |archive-url=https://ghostarchive.org/varchive/youtube/20211212/7ZolXFbWkRM| archive-date=2021-12-12 |url-status=live|format= |work=G4G Celebration |publisher=[[Gathering 4 Gardner]] |location= |date=April 2018 |access-date=3 June 2019 |quote=}}{{cbignore}}</ref><ref name=ams>{{cite journal|title=AMS Updates: Death of AMS Members|journal=Notices of the American Mathematical Society|date=August 2023|volume=70|issue=7|page=1147|url=https://www.ams.org/journals/notices/202307/noti2744/noti2744.html}}</ref> | birth_place = [[Ferguson, Missouri]], U.S.<ref>{{Cite web |last=O'Connor |first=J J |last2=Robertson |first2=E F |date=September 2023 |title=David Singmaster |url=https://mathshistory.st-andrews.ac.uk/Biographies/Singmaster/ |url-status=live |archive-url=https://web.archive.org/web/20240528103115/https://mathshistory.st-andrews.ac.uk/Biographies/Singmaster/ |archive-date=2024-05-28 |access-date=2024-09-27 |publisher=[[University of St Andrews]] |language=en}}</ref> | death_date = {{death date and age|2023|02|13|1938|12|14|df=y}} | death_place = | death_cause = | fields = [[Mathematics]] | workplaces = [[London South Bank University]] | patrons = | education = | alma_mater = [[University of California, Berkeley]] | thesis_title = On Means of Differences of Consecutive Integers Relatively Prime to m | thesis_url = | thesis_year = 1966 | doctoral_advisors = [[Derrick Henry Lehmer|Dick Lehmer]], [[Russell Sherman Lehman|Russell Lehman]] | academic_advisors = | doctoral_students = | notable_students = | known_for = [[Singmaster's conjecture]]<br />[[Singmaster notation]]<br />History of mathematics<br />Mathematics of puzzles, especially the [[Rubik's cube]] | influences = | influenced = | awards = | signature = <!--(filename only)--> }} '''David Breyer Singmaster''' (14 December 1938 β 13 February 2023) was an American-British mathematician who was emeritus professor of mathematics at [[London South Bank University]], England. He had a huge personal collection of [[mechanical puzzle]]s and books of [[brain teaser]]s. He was most famous for being an early adopter and enthusiastic promoter of the [[Rubik's Cube]]. His ''Notes on Rubik's "Magic Cube"'' which he began compiling in 1979 provided the first mathematical analysis of the Cube as well as providing one of the first published solutions. The book contained [[Singmaster notation|his cube notation]] which allowed the recording of [[Rubik's Cube]] moves, and which quickly became the standard. Singmaster was both a puzzle historian and a composer of puzzles, and many of his puzzles were published in newspapers and magazines. In [[combinatorial number theory]], [[Singmaster's conjecture]] states that there is an upper bound on the number of times a number other than 1 can appear in [[Pascal's triangle]].
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