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Topic: Adriaan van Roomen

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	Roomen (Site not responding. Last check: 2007-10-18)
		Roomen was professor of mathematics and medicine at Louvain from 1586 to 1592, he then went to Würzburg where again he was professor of medicine.
		Roomen was critical of the accuracy of the tables and wrote to Clavius at the Collegio Romano in Rome pointing out that, to calculate tangent and secant tables correctly to ten decimal places, it was necessary to work to 20 decimal places for small values of sine, see [2].
		Roomen also wrote a commentary on al-Khwarizmi's Algebra but the only two known copies were destroyed in 1914 and 1944 (as a result of World War I and World War II).
	www-history.mcs.st-and.ac.uk /history/Mathematicians/Roomen.html (391 words)

	VIGEE-LEBRUN, M. A. E. - LoveToKnow Article on VIGEE-LEBRUN, M. A. E. (Site not responding. Last check: 2007-10-18)
		An evidence of the good use he made of his means, as well as of the kindliness of his character, is furnished by the fact that he entertained as a guest for a whole month a scientific adversary, Adriaan van Roomen, and then paid the expenses of his journey home.
		Vieta's writings thus became very quickly known; but, when Franciscus van Schooten issued a general edition of his works in 1646, he failed to make a complete collection, although probably nothing of very great value has perished.
		In that year Adriaan van Roomen gave out as a problem to all mathematicians an equation of the 45th degree, which, being recognized by Vieta as depending on the equation between sin
	www.1911encyclopedia.org /V/VI/VIGEE_LEBRUN_M_A_E_.htm (2824 words)

	Adriaan van Roomen -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-18)
		Adriaan van Roomen (29 September 1561 - 4 May 1615), also known as Adrianus Romanus, was a (A native or inhabitant of Belgium) Belgian (A person skilled in mathematics) mathematician.
		He was born in (additional info and facts about Leuven) Leuven, where he became professor, but then travelled extensively in Europe.
		He worked in (The mathematics of generalized arithmetical operations) algebra, (The mathematics of triangles and trigonometric functions) trigonometry and (The pure mathematics of points and lines and curves and surfaces) geometry; and on the (additional info and facts about decimal expansion) decimal expansion of π.
	www.absoluteastronomy.com /encyclopedia/a/ad/adriaan_van_roomen.htm (118 words)

	CIRCLE - LoveToKnow Article on CIRCLE (Site not responding. Last check: 2007-10-18)
		Thus in connection with the subject a genus of workers became possible who may be styled n-computers or circle-squarers a name which, if it connotes anything uncomplimentary, does so because of the almost entirely fruitless character of their labors.
		His book, Van den Circkel (Delft, 1596), gave the ratio correct to 20 places, but he continued his calculations as long as he lived, and his best result was published on his tombstone in St Peters church, Leiden.
		Van Ceulens process was essentially identical with that of Vieta.
	4.1911encyclopedia.org /C/CI/CIRCLE.htm (4714 words)

	Van_Ceulen (Site not responding. Last check: 2007-10-18)
		Ludolph Van Ceulen does not appear to have had a university education as his parents were not sufficiently wealthy to pay for one.
		Van Ceulen had several friends among the mathematicians of the time.
		In particular his friendships with Simon Stevin and Adriaan Van Roomen were important for van Ceulen's career.
	www-groups.dcs.st-and.ac.uk /~history/Mathematicians/Van_Ceulen.html (225 words)

	François Viète (Site not responding. Last check: 2007-10-18)
		Being wealthy, he printed numerous papers at his own expense, in which he wrote on various branches of the science, and sent them to scholars in almost every country of Europe.
		Evidence of his character is found in the fact that he entertained as a guest, for a whole month, a scientific adversary, Adriaan van Roomen, and then paid the expenses of his journey home.
		Vieta's writings became very quickly known; but, when Franciscus van Schooten issued a general edition of his works in 1646, some were lost.
	www.worldhistory.com /wiki/F/Fran%E7ois-Vi%E8te.htm (1085 words)

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