For the 12th century physicist and astronomer, see Al-Khazini.
Abu Jafar Muhammad ibn Hasan Khazini (900–971) was a PersianMuslimastronomer and mathematician from Khorasan. He worked on both astronomy and number theory.
Khazini was one of the scientists brought to the court in Ray, Iran by the ruler of the Buyid dynasty, Adhad ad-Dowleh, who ruled from 949 to 983 AD. In 959/960 Khazini was required by the Vizier of Ray, who was appointed by ad-Dowleh, to measure the obliquity of the ecliptic.
One of al-Khazin's works Zij al-Safa'ih ("Tables of the disks of the astrolabe") was described by his successors as the best work in the field and they make many references to it. The work describes some astronomical instruments, in particular an astrolabe fitted with plates inscribed with tables and a commentary on the use of these. A copy of this instrument was made but vanished in Germany at the time of World War II. A photograph of this copy was taken and examined in D.A. King's New light on the Zij al-Safa'ih of Abu Ja'far al-Khazin, Centaurus 23 (2) (1979/80), 105-117.
Khazeni also wrote a commentary on Ptolemy's Almagest in which he gives nineteen propositions relating to statements by Ptolemy. He also proposed a different solar model from that of Ptolemy.
Diophantine analysis
According to mathematics historian Odile Kouteynikoff:
According to the fact that Al-Khwarizmi founded Algebra during the 9th century, it is not surprising that, when being translated into Arabic in the late 9th century by LebaneseIbn Luqa whose native language was Greek, Diophante’s Arithmetics seemed to be considered as a treatise about Algebra since algebraic vocabulary and way of thinking were most widely shared. Only few people understood that it was actually an arithmetic treatise: Al-Khazin (900–971) did, and therefore he is one of those who laid the foundations for the integer Diophantine analysis. We know that Jean de Palerme submitted Al-Khazin’s problem about congruent numbers to Fibonacci, who then wrote Liber Quadratorum.[1]
Rashed, Roshdi (1996). Les Mathématiques Infinitésimales du IXe au XIe Siècle 1: Fondateurs et commentateurs: Banū Mūsā, Ibn Qurra, Ibn Sīnān, al-Khāzin, al-Qūhī, Ibn al-Samḥ, Ibn Hūd. Reviews: Seyyed Hossein Nasr (1998) in Isis89 (1) pp. 112-113; Charles Burnett (1998) in Bulletin of the School of Oriental and African Studies, University of London61 (2) p. 406.
Ahmad Nahavandi ·Al-Fadl ibn Naubakht ·Ibrāhīm al-Fazārī and his son ·Mashallah ibn Athari ·Yaʿqūb ibn Ṭāriq
9th c.
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10th c.
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11th c.
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'Abd al-Hamīd ibn Turk ·Sind ibn Ali ·Al-Abbās ibn Said al-Jawharī ·Al-Ḥajjāj ibn Yūsuf ibn Maṭar ·Al-Kindi ·Al-Mahani ·Banū Mūsā ·Hunayn ibn Ishaq ·Muḥammad ibn Mūsā al-Khwārizmī ·Thābit ibn Qurra ·Na'im ibn Musa ·Sahl ibn Bishr ·Habash al-Hasib al-Marwazi
10th century
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11th century
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