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Abraham bar Hiyya

Abraham bar Ḥiyya ha-Nasi
אברהם בר חייא הנשיא
Bornc. 1070
Barcelona, Catalonia, Spain
Died1136 or 1145[1][2]
Narbonne or Provence
Known forQuadratic equation
Hebrew calendar
Scientific career
FieldsAstronomy
Mathematics

Abraham bar Ḥiyya ha-Nasi[note 1] (Hebrew: ר׳ אַבְרָהָם בַּר חִיָּיא הַנָשִׂיא; c. 1070 – 1136 or 1145), also known as Abraham Savasorda,[note 2] Abraham Albargeloni, and Abraham Judaeus, was a Catalan Jewish mathematician, astronomer and philosopher who resided in Barcelona.

Bar Ḥiyya was active in translating the works of Islamic science into Latin and was likely the earliest to introduce algebra from the Muslim World into Christian Europe. He also wrote several original works on mathematics, astronomy, Jewish philosophy, chronology, and land surveying. His most influential work is his Ḥibbur ha-Meshiḥah ve-ha-Tishboret, translated in 1145 into Latin as Liber embadorum.[11] A Hebrew treatise on practical geometry and algebra, the book contains the first known complete solution of the quadratic equation , and influenced the work of Leonardo Fibonacci.[12]

  1. ^ Langermann, Y. Tzvi (2007). "Bar Ḥiyya: Abraham Bar Ḥiyya Savasorda". In Thomas Hockey; et al. (eds.). The Biographical Encyclopedia of Astronomers. New York: Springer. pp. 95–6. ISBN 978-0-387-31022-0. (PDF version)
  2. ^ Cite error: The named reference EotMA was invoked but never defined (see the help page).
  3. ^ Rapoport, Hegyon ha-Nefesh, p. 63.
  4. ^ Cite error: The named reference JE was invoked but never defined (see the help page).
  5. ^ Katz, Shlomo, ed. (14 March 1998). "R' Avraham ben Chiya Hanasi mi'Barcelona". HaMaayan / The Torah Spring. XII (18): 4.
  6. ^ a b Cite error: The named reference geiger was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference drechsler was invoked but never defined (see the help page).
  8. ^ Allgemeine Enzyklopädie der Wissenschaften und der Künste, Part 1, Vol. 1, p. 157; Poggendorff’s Handwörterbuch, Volume I, A-L, 1863 Leipzig.
  9. ^ Goldstein, Bernard R. (2001). "Kepler and Hebrew Astronomical Tables". Journal for the History of Astronomy. 32 (107): 130–136. Bibcode:2001JHA....32..130G. doi:10.1177/002182860103200203. ISSN 0021-8286. S2CID 117455118.
  10. ^ Millás Vallicrosa, José M. (1959). La obra Séfer hešbón mahlekot ha-kokabim de R. Abraham bar Hiyya ha-Bargeloní. Barcelona: Instituto Arias Montano. pp. 13–14.
  11. ^ Kaunzner, Wolfgang (1987). "On the Transmission of mathematical Knowledge to Europe". Sudhoffs Archiv. 71 (2). Franz Steiner Verlag: 129–140. JSTOR 20777136.
  12. ^ Levey, Martin (September 1952). "The Encyclopedia of Abraham Savasorda: A Departure in Mathematical Methodology". Isis. 43 (3): 257–264. doi:10.1086/348115. JSTOR 227469. S2CID 144775595.


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