Ahmed

Ahmed ibn Yusuf

Born: 835 in Baghdad (now in Iraq)
 Died: 912 in Cairo, Egypt

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Ahmed ibn Yusuf wrote on ratio and proportion and it was translated into Latin by Gherard of Cremona. The book is largely a commentary on, and expansion of, Book 5 of Euclid's Elements .

Ahmed ibn Yusuf also gave methods to solve tax problems which appear in Fibonacci's Liber Abaci . He was also quoted by Bradwardine, Jordanus and Pacioli.

References (2 books/articles)

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JOC/EFR December 1996