Sharaf al-Din al-Tusi
Sharaf al-Din al-Muzaffar ibn Muhammad ibn al-Muzaffar al-Tusi (* around 1135 in Tus , Province Khorasan , Iran , † 1213 in Iran) was a Persian mathematician and astronomer.
Little is known about his life. Around 1154 he is in Damascus , where he teaches mathematics and astronomy ( Euclid , Claudius Ptolemy ), and he also taught in Aleppo , where he taught both Jews and Muslims. Then he went to Mosul , where he taught Kamal al-Din ibn Yunus, the teacher of Nasir ad-Din at-Tusi . He returned to Iran around the time of Saladin's conquest of Damascus (1174). Towards the end of his life he taught in Baghdad , where he also wrote his work on algebra in 1209. It has been preserved in an adaptation by an unknown author.
In his algebra he deals with equations up to the third degree, with applications in geometry in mind ( Roshdi Rashed ). When discussing the existence of solutions to individual cubic equations, he implicitly used the derivative of a function (in this case a polynomial when determining its maximum value).
The Horner scheme for calculating the zeros of cubic polynomials can also be found with him .
He also invented and published a stick astrolabe.
literature
- Roshdi Rashed Sharaf al-Din al-Tusi. Oeuvres mathématique. Algèbre et géométrie au XIIe siècle , 2 volumes, Paris 1986
Web links
- John J. O'Connor, Edmund F. Robertson : Sharaf al-Din al-Tusi. In: MacTutor History of Mathematics archive .
Individual evidence
| personal data | |
|---|---|
| SURNAME | Tusi, Sharaf al-Din al- |
| ALTERNATIVE NAMES | Tusi, Sharaf al-Din Al-Muzaffar ibn Muhammad ibn Al-Muzaffar al- |
| BRIEF DESCRIPTION | Persian mathematician and astronomer |
| DATE OF BIRTH | around 1135 |
| PLACE OF BIRTH | Tus |
| DATE OF DEATH | 1213 |
| Place of death | Iran |