Ludolph van Ceulen: Perbedaan antara revisi
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* {{MathGenealogy |id=125232 |name=Ludolph van Ceulen }}
* [http://www.ams.org/samplings/math-history/hap-6-pi.pdf "Digits of Pi" by Barry Cipra] (includes photo of tombstone)
* Oomes, R. M. Th. E.; Tersteeg, J. J. T. M.; Top, J. "The epitaph of Ludolph van Ceulen." ''Nieuw Arch. Wiskd. (5)''
* [http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Van_Ceulen.html MacTutor biography of van Ceulen]
* {{cite web| url=http://www.math.leidenuniv.nl/~wiskonst/ruziesceulen/biovc.html | title=Ludolph van Ceulen (1540-1610) | archiveurl=http://web.archive.org/web/20060505103533/http://www.math.leidenuniv.nl/~wiskonst/ruziesceulen/biovc.html | archivedate=5 May 2006 | accessdate=31 March 2008 | language=Dutch}}
Baris 43:
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{{DEFAULTSORT:Ceulen, Ludolph van}}
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