Abu Sahl al-Quhi
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Script error: No such module "lang". (Script error: No such module "lang".; Template:Langx Abusahl Bijan-e Koohi) was a Persian[1][2] mathematician, physicist and astronomer. He was from Kuh (or Quh), an area in Tabaristan, Amol, and flourished in Baghdad in the 10th century. He is considered one of the greatest geometers, with many mathematical and astronomical writings ascribed to him.[3][4][5]
Al-Qūhī was the leader of the astronomers working in 988 AD at the observatory built by the Buwayhid amir Sharaf al-Dawla in Badhdad. He wrote a treatise on the astrolabe in which he solves a number of difficult geometric problems.
In mathematics he devoted his attention to those Archimedean and Apollonian problems leading to equations higher than the second degree. He solved some of them and discussed the conditions of solvability. For example, he was able to solve the problem of inscribing an equilateral pentagon into a square, resulting in a fourth degree equation.[6] He also wrote a treatise on the "perfect compass", a compass with one leg of variable length that allows users to draw any conic section: straight lines, circles, ellipses, parabolas and hyperbolas.[7][8] It is likely that al-Qūhī invented the device.[9][10][11]
Like Aristotle, al-Qūhī proposed that the weight of bodies varies with their distance from the center of the Earth.[12]
The correspondence between al-Qūhī and Abu Ishaq al-Sabi, a high civil servant interested in mathematics, has been preserved.[13][14]
References
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- ↑ Script error: No such module "Citation/CS1".
- ↑ al-Qūhī, Abu Sahl Wayjan ibn Rustam (c. 940-c. 1000)
- ↑ Suter, Die Mathematiker und Astronomen der Araber (75-76, 1900). In his treatise On Rising Times, he wrote that he had also investigated astronomy as well as centers of gravity and optics. His Perfect Compass, for example, represented a step beyond Ibn Sina’s pointwise constructions of conic sections and described an instrument al-Qūhī characterized as useful for drawing these sections on sundials and astrolabes.
- ↑ Script error: No such module "citation/CS1". (PDF version)
- ↑ Script error: No such module "citation/CS1".
- ↑ Jan Hogendijk (1984) "al-Kuhi's construction of an equilateral pentagon in a given square", Zeitschrift für Gesch. Arab.-Islam. Wiss. 1: 100-144; correction and addendum Volume 4, 1986/87, p.267
- ↑ Script error: No such module "citation/CS1".
- ↑ Jan Hogendijk (2008) "Two beautiful geometrical theorems by Abu Sahl Kuhi in a 17th century Dutch translation", Ta'rikh-e Elm: Iranian Journal for the History of Science 6: 1-36
- ↑ Script error: No such module "citation/CS1".Template:Cbignore Alt URL
- ↑ Script error: No such module "citation/CS1". Reviews: Seyyed Hossein Nasr (1998) in Isis 89 (1) pp. 112-113 JSTOR 236661; Charles Burnett (1998) in Bulletin of the School of Oriental and African Studies, University of London 61 (2) p. 406 JSTOR 3107736.
- ↑ John Lennart Berggren, Hogendijk: The Fragments of Abu Sahl al-Kuhi's Lost Geometrical Works in the Writings of al-Sijzi, in: C. Burnett, J.P. Hogendijk, K. Plofker, M. Yano (eds): Studies in the History of the Exact Sciences in Honour of David Pingree, Leiden: Brill, 2003, pp. 605–665
- ↑ Mohammed Abattouy (2002), "The Arabic Science of weights: A Report on an Ongoing Research Project", The Bulletin of the Royal Institute for Inter-Faith Studies 4, p. 109-130
- ↑ Berggren: "The correspondence of Abu Sahl al-Kuhi and Abu Ishaq al-Sabi: a translation with commentaries", J. Hist. Arabic Sci., volume 7, 1983, pp. 39-124.
- ↑ M. Steinschnieder, Lettere intorno ad Alcuhi a D. Bald. Boncompagni (Roma, 1863)
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Further reading
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