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Ibn al-Banna
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Ibn al-Banna al-Marrakushi al-Azdi also known as Abu'l-Abbas Ahmad ibn Muhammad ibn Uthman al-Azdi. (Arabic: ابن البنّا) [29)December 1256 – c. 1321] was an Arab mathematician and astronomer. The Al-Marrakushi crater, on the Moon, is named after him.

Biography

Al-Banna, the son of an architect, was born in Marrakesh in 1256. Having learned basic mathematical and geometrical skills he proceeded to translate Euclid's Elements into Arabic.
   Al-Banna wrote between 51 to 74 treatises, encompassing such varied topics as Algebra, Astronomy, Linguistics, Rhetoric, and Logic. One of his works, called Talkhis amal al-hisab (Arabic, تلخيص عمل الحساب ) (Summary of arithmetical operations), includes topics such as fractions, sums of squares and cubes etc. Another, called Tanbih al-Albab, covers topics related to:
  • calculations regarding the drop in irrigation canal levels,
  • arithmetical explanation of the Muslim laws of inheritance
  • determination of the hour of the Asr prayer,
  • explanation of frauds linked to instruments of measurement,
  • enumeration of delayed prayers which have to be said in a precise order,and
  • calculation of legal tax in the case of a delayed payment
Yet another work by al-Banna was Raf al-Hijab (Lifting the Veil) which included topics such as computing square roots of a number and theory of continued fractions.

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