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. (14th century - 15th century - 16th century - other centuries) As a means of recording the passage of time, the 15th century was that century which lasted from 1401 to 1500. ... Louis XI the Prudent (French: Louis XI le Prudent) (July 3, 1423 – August 30, 1483), also informally nicknamed luniverselle aragne (old French for universal spider), or the Spider King, was King of France (1461–1483). ...
He published a manuscript in 1475 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 In 1509 Balboa tried to join a Spanish expedition but could not because he owed so many debts January 10—Stephen III of Moldavia defeats the Ottoman Empire at the Battle of Vaslui. ... Billion may mean: 1,000,000,000 (one thousand million; ), used by most English-speaking countries (American and usual modern British meaning) 1,000,000,000,000 (one million million; ), used by most other countries outside Asia (older British meaning). ... The numeral trillion refers to one of two number values, depending on the context of where and how it is being used. ... The long and short scales are two different numerical systems used throughout the world. ... The long and short scales are two different numerical systems used throughout the world. ...
References
(French)
Bibliothèque St Geneviève, Paris, MS Français 3143 - original manuscript by Jehan Adam
Jehan Adam, Traicté en arismetique pour la practique par gectouers… Parchemin. XVe siècle (1475).
(English)
Lynn Thorndike, "The Arithmetic of Jehan Adam, A.D. 1475," Science and Thought in the Fifteenth Century
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