## New Results In The Research On Some Mathematical Works Of Nasir Al-Din Al-Tusi

The article analyses the mathematical contents of four texts by Nasir al-Din al-Tusi (1201-1274), one of the most original and prolific scientists of the classical Islamic tradition. These four texts on mathematics are: Al-Tusi's Tahrir (Exposition) of Euclid's Elements, the text Shakl al-Qatta', The Risala al-Shafiya in which Al-Tusi made a substantial contribution to solve the classical problem of parallel lines, and finally the treatise of artithmetic Jami' al-hisab.

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