Abu Bakr al-Hassar
Al-Hassar or Abu Bakr Muhammad ibn Abdallah ibn Ayyash al-Hassar (Arabic: أبو بكر محمد ابن عياش الحصَار) was a 12th-century Moroccan mathematician. He is the author of two books Kitab al-bayan wat-tadhkar (Book of Demonstration and Memorization), a manual of calculation and Kitab al-kamil fi sinaat al-adad (Complete Book on the Art of Numbers), on the breakdown of numbers. The first book is lost and only a part of the second book remains.[1]
Al-Hassar developed the modern symbolic mathematical notation for fractions, where the numerator and denominator are separated by a horizontal bar. This same fractional notation appeared soon after in the work of Fibonacci in the 13th century.
References
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Further reading
[edit | edit source]- Suter, Heinrich, Beitraege zur Geschichte der Mathematik und Astronomie im Islam. Nachdruck seiner Schriften aus den Jahren 1892-1922. [Contributions to the history of mathematics and astronomy in Islam. Reprint of his works from the years 1892-1922]. Hrsg. von Fuat Sezgin. Baende 1 und 2. [Ed. by Fuat Sezgin. Volumes 1 and 2] Veroeffentlichungen des Institutes fuer Geschichte der Arabisch-Islamischen Wissenschaften. Reihe B: Nachdrucke, Abteilung Mathematik, Bd. 1 [Publications of the Institute for the History of Arabic-Islamic Sciences. Series B: Section Mathematics, vol. 1] Frankfurt am Main: Institut fuer Geschichte der Arabisch- Islamischen Wissenschaften an der Johann Wolfgang Goethe-Universitaet, 1986. Band I: xiii, 761 S.; Band II: x, 724 S.
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External links
[edit | edit source]- Prof. Paul Kunitzsch, Al-Hassâr's Kitâb al-Bayân and the Transmission of the Hindu-Arabic Numerals [1] retrieved 01-09-2010)
- Manuscript of Kitâb al-bayân wa-l-tadhkâr, online by Library of the University of Pennsylvania, Philadelphia [2] (retrieved 01-09-2010)
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