Kamal al-Din Abul Hasan Muhammad Al-Farisi (in Persian: كمال الدين ابوالحسن محمد الفارسي) Persia or Persian most often refer to: Persia The Persians, an ethnic group, also called Tajiks Persian language Persian (Pokémon) See also Iranian, Iranian peoples, Iranian languages and Aryan. ...

(1260 - 1320) was a prominent Persian mathematician and physicist. Events End of the reign of Emperor Go-Fukakusa of Japan Emperor Kameyama ascends to the throne of Japan September 3 - Mongols defeated by Mameluks at Battle of Ain Jalut Samogatians and Curonians defeats Teutonic knights in Battle of Durbe Births Maximus Planudes, Byzantine grammarian and theologian Deaths Monarchs/Presidents... Events January 20 - Duke Wladyslaw Lokietek becomes king of Poland April 6 - The Scots reaffirm their independence by signing the Declaration of Arbroath. ... Persia or Persian most often refer to: Persia The Persians, an ethnic group, also called Tajiks Persian language Persian (Pokémon) See also Iranian, Iranian peoples, Iranian languages and Aryan. ... A mathematician is a person whose area of study and research is mathematics. ... A physicist is a scientist trained in physics. ...

He made two major contributions to mathematics, one on optics, the other on number theory. His work on light, colour and the rainbow is discussed in 'Dictionary of Scientific Biography (New York 1970-1990)', and his contributions to number theory are discussed in the references: See also list of optical topics. ... Traditionally, number theory is that branch of pure mathematics concerned with the properties of integers. ...

• 'R Rashed, The development of Arabic mathematics : between arithmetic and algebra (London, 1994).'
• 'R Rashed, Entre arithmétique et algèbre: Recherches sur l'histoire des mathématiques arabes (Paris, 1984).'
• 'A G Agargün and C R Fletcher, al-Farisi and the fundamental theorem of arithmetic, Historia Math. 21 (2) (1994), 162-173.'
• 'R Rashed, Materials for the study of the history of amicable numbers and combinatorial analysis (Arabic), J. Hist. Arabic Sci. 6 (1-2) (1982), 278-209.'
• 'R Rashed, Nombres amiables, parties aliquotes et nombres figurés aux XIIIème et XIVème siècles, Arch. Hist. Exact Sci. 28 (2) (1983), 107-147.'
• 'R Rashed, Le modèle de la sphère transparente et l'explication de l'arc-en-ciel : Ibn al-Haytham - al-Farisi, Revue d'histoire des sciences 22 (1970), 109-140.'

Al-Farisi was a pupil of the great astronomer and mathematician Qutb al-Din al-Shirazi, who in turn was a pupil of Nasir al-Din Tusi. His work on optics was prompted by a question put to him concerning the refraction of light. Shirazi advised him to consult the Optics of Alhazen, and al-Farisi made such a deep study of this treatise that Shirazi suggested that he write what is essentially a revision of that major work, which came to be called the 'Tanqih'. Shirazi himself was writing a commentary on works of Avicenna at the time. Photo taken from medieval manuscript by Qotbeddin Shirazi. ... Nasir Tusi or Abu Jafar Muhammad Ibn Muhammad Ibn al-Hasan Nasir al-Din al-Tusi (1201–1274, near Baghdad) was a Persian scientist, of Shia islamic belief, born in Tus, Khorasan (then Persia, present time Iran). ... Avicenna was the greatest of the medieval Islamic physicians, whose work had a direct impact on the Renaissance. ...

Al-Farisi made a number of important contributions to number theory. His most impressive work in number theory is on amicable numbers. In Tadhkira al-ahbab fi bayan al-tahabb ("Memorandum for friends on the proof of amicability") introduced a major new approach to a whole area of number theory, introducing ideas concerning factorisation and combinatorial methods. In fact al-Farisi's approach is based on the unique factorisation of an integer into powers of prime numbers.

He died in Tabriz, Persia. Tabriz City Hall, built in 1895, by Arfaol molk, with the aid of German engineers. ... Persia and Persian can refer to: the Western name for Iran. ...

See also

• List of Iranian scientists

Photo taken from medieval manuscript by Qotbeddin Shirazi. ...

External link

• St Andrew's School of Mathematics Biography of Al-Farisi