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{{transl|ar|ALA|Al-ʿAbbās ibn Saʿid al-Jawharī}} (c. 800 Baghdad? – c. 860 Baghdad?) was a geometer who worked at the House of Wisdom in Baghdad and for in a short time in Damascus where he made astronomical observations. He was probably of Iranian origin.[1] His most important work was his Commentary on Euclid's Elements which contained nearly 50 additional propositions and an attempted proof of the parallel postulate. References {{refbegin|2}}1. ^{{cite book | last = Selin | first = Helaine | title = Encyclopaedia of the history of science, technology, and medicine in non-western cultures | publisher = Springer | location = Berlin New York | year = 2008 | isbn = 9781402049606 | page=129 | quote=Probably of Iranian origin, al-˓Abbās Ibn Sa˓īd al-Jawharī was one of the court astronomers/astrologers of Caliph al-Ma˒mūn (r. 813–833) in charge of the construction of astronomical instruments.}}
- {{cite journal|first=Gregg|last=De Young|title=Al-Jawhari's additions to Book V of Euclid's Elements|journal=Zeitschrift für Geschichte der Arabisch-Islamischen Wissenschaften|volume=11|issue=10|year=1997|pages=153–178}}
- {{cite journal|first=A. E.-A.|last=Hatipov|title=The theory of parallel lines in the medieval East|language=Russian|journal=Trudy Samarkand. Gos. Univ. (N.S.) Vyp.|volume=144|year=1964|pages=5–47}}
- {{cite book|first=Khalil|last=Jaouiche|title=La théorie des parallèles en pays d’Islam: Contribution à la préhistoire des géométries non euclidiennes|isbn=2-7116-0920-0|publisher=J. Vrin|language=French|year=1986}}
- {{cite book|first=Boris Abramovich|last=Rozenfeld|title=The History of Non-Euclidean Geometry: Evolution of the Concept of a Geometric Space|year=1988|publisher=Springer|isbn=0-387-96458-4}}
{{refend}}External links- {{cite encyclopedia | editor = Thomas Hockey | last = Bolt | first = Marvin | title=Jawharī: al‐ʿAbbās ibn Saʿīd al‐Jawharī | encyclopedia = The Biographical Encyclopedia of Astronomers | publisher = Springer | year = 2007 | location = New York | pages = 591–2 | url=http://islamsci.mcgill.ca/RASI/BEA/Jawhari_BEA.htm | isbn=978-0-387-31022-0|display-editors=etal}} (PDF version)
- {{cite encyclopedia | last = Sabra | first = Abdelhamid I. | title=Al-Jawharī, Al-‘Abbās Ibn Sa‘īd | url=http://www.encyclopedia.com/doc/1G2-2830902171.html | encyclopedia = Dictionary of Scientific Biography |volume=VII|pages=79–80|year=1973}}
- {{MacTutor|id=Al-Jawhari|title=al-Abbas ibn Said Al-Jawhari|date=November 1999}}
{{Islamic mathematics}}{{authority control}}{{DEFAULTSORT:Jawhari, Abbas Said}}{{asia-mathematician-stub}}{{Iraq-scientist-stub}} 8 : Mathematicians of medieval Islam|9th-century mathematicians|800 births|860 deaths|People from Baghdad|Medieval Iraqi mathematicians|9th-century Abbasid people|Medieval Persian mathematicians |