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:

  1. Dictionary of Scientific Biography
  2. M Steinschneider, Yusuf ben Ibrahim und Ahmed ibn Yusuf, Bibliotheca mathematica (1888), 49-117.
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JOC/EFR February 1996