- Jehan Adam
Infobox Person
name = Jehan Adam
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birth_date = 15th century
birth_place = FRA
death_date = unknown
death_place = FRA
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nationality = French
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occupation =Mathematician ,accountant
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footnotes =Jehan Adam was a French mathematician who flourished in the 15th century. He was secretary to Nicholle Tilhart, who was notary, secretary and auditor of accounts to King
Louis XI of France .He published a manuscript in 1475 [Bibliothèque St Geneviève, Paris, MS Français 3143 - original French manuscript by Jehan Adam] [ [http://www-bsg.univ-paris1.fr/la_reserve/expos/sciences/savants2.htm Jehan Adam, Traicté en arismetique pour la practique par gectouers… Parchemin. XVe siècle (1475).] ] [Lynn Thorndike, "The Arithmetic of Jehan Adam, A.D. 1475," Science and Thought in the Fifteenth Century] containing the first use of the terms "by-million" and "tri-million", which gave rise to the modern terms "billion" and "trillion". His usage referred to the long scale values of 1012 and 1018 respectively. These terms have subsequently been revalued in English to the short scale values 109 and 1012 respectively, although the original values remain in long scale countries.
References
Persondata
NAME = Adam, Jehan
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SHORT DESCRIPTION = Mathematician
DATE OF BIRTH = 15th century
PLACE OF BIRTH = France
DATE OF DEATH = unknown
PLACE OF DEATH = France
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