Sharaf al-Din al-Tusi شرفالدین التوسی
Al-Tusi has been credited with proposing the idea of a function in Mathematics.
Full Name: Sharaf al-Dīn al-Muẓaffar ibn Muḥammad ibn al-Muẓaffar al-Ṭūsī.
Other Names: Sharaf al-Din al-Tusi
Arabic: شرفالدین مظفر بن محمد بن مظفر توسی
Born: 1135 AD.
Died: 1213 AD.
Origin: Tus, Iran.
Famous for: Mathematicians.
Legacy: The main-belt asteroid 7058 Al-Ṭūsī, discovered by Henry E. Holt at Palomar Observatory in 1990, was named in his honor.
Contributions:
He developed a novel method for determining the conditions under which certain types of cubic equations would have two, one, or no solutions.
Sharaf al-Din invented a linear astrolabe, sometimes called the “Staff of Tusi”. While it was easier to construct and was known in al-Andalus.
Articles
https://en.wikipedia.org/wiki/Sharaf_al-Din_al-Tusi
https://mathshistory.st-andrews.ac.uk/Biographies/Al-Tusi_Sharaf/
Books attributed to Sharaf al-Din al-Tusi: