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Scientist:

Abu Ja'far Muhammad Ibn Musa Al-Khwarizmi

Arab mathematician, astronomer, and geographer (c. 800–847)

Al-Khwarizmi takes his name from his birthplace, Khwarizm (now Khiva in Uzbekistan). His importance lies chiefly in the knowledge he transmitted to others. Very little is known about his life except that he was a member of the academy of sciences in Baghdad, which flourished during the rule (813–33) of caliph al-Ma'mun. Al-Khwarizmi's main astronomical treatise and his chief mathematical work, the Algebra, are dedicated to the caliph. The Algebra enlarged upon the work of Diophantus and is largely concerned with methods for solving practical computational problems rather than algebra as the term is now understood. Insofar as he did discuss algebra, al-Khwarizmi confined his discussion to equations of the first and second degrees.

His astronomical work, Zij al-sindhind, is also based largely on the work of other scientists. As with the Algebra, its chief interest is as the earliest Arab work on the subject still in existence.

Al-Khwarizmi's other main surviving works are a treatise on the Hindu system of numerals and a treatise on geography. The Hindu number system, with its epoch-making innovations, for example the incorporation of a symbol for zero, was introduced to Europe via a Latin translation (De numero indorum; On the Hindu Art of Reckoning) of al-Khwarizmi's work. Only the Latin translation remains but it seems certain that al-Khwarizmi was the first Arab mathematician to expound the new number system systematically. The term ‘algorithm’ (a rule of calculation) is a corrupted form of his name. His geographical treatise marked a considerable improvement over earlier work, notably in correcting some of the influential errors and misconceptions that had gained currency owing to Ptolemy's Geography.

 
 
Biography: Muhammad ibn Musa al-Khwarizmi

Muhammad ibn Musa al-Khwarizmi (died ca. 850) was a Moslem mathematician, astronomer, and geographer and one of the most seminal scientific minds of early Islamic culture.

Al-Khwarizmi flourished at the court of the Abbasid caliph al-Mamun (reigned 813-833), whose interest in science and philosophy gave great impetus to scholarly investigation and to a copious translation movement from Greek via Syriac into Arabic. Very little is known of al-Khwarizmi's life, although his name indicates at least a family origin in the Persian culture of the Oxus River (Amu Darya) delta. He may have been attached to al-Mamun's scientific academy in Baghdad, the House of Wisdom (Arabic, Bayt al-Hikma), and it is probable that he participated in the calculation of the length of a degree of latitude, which took place during al-Mamun's reign.

To al-Khwarizmi we owe the world "algebra," from the title of his greatest mathematical work, Hisab al-Jabr wa-al-Muqabala (Calculation for Integration and Equation). The book, which was twice translated into Latin, by both Gerard of Cremona and Robert of Chester in the 12th century, works out several hundred simple quadratic equations by analysis as well as by geometrical example. It also has substantial sections on methods of dividing up inheritances and surveying plots of land. Al-Khwarizmi was one of the early popularizers in the Islamic world of the numeral system, which, along with the zero concept, is called Arabic in the West but which was borrowed at about this time from India. A technical term for the Arabic numerals, no longer much in use, is derived from the very name al-Khwarizmi: algorism.

Al-Khwarizmi also wrote a treatise on arithmetic which has survived only in a medieval Latin translation; Arabic bibliographies of the period mention two books by him on the astrolabe and one on sundials, although none of these seems to have come down to us. Al-Khwarizmi also compiled the first astronomical tables known in the Moslem world. They were translated into Latin, together with their lengthy introduction, by Adelard of Bath in 1126.

Of great importance also was al-Khwarizmi's contribution to medieval geography. His improvement upon Ptolemy's work is entitled Surat al-Ard (The Shape of the Earth). The text exists in a manuscript; the maps have unfortunately not been preserved, although modern scholars have been able to reconstruct them from al-Khwarizmi's descriptions.

Further Reading

The Hisab al-Jabr was translated into English with a useful biographical introduction and notes by Louis Charles Karpinski, Robert of Chester's Latin Translation of the Algebra of al-Khowarizmi (1915). Seyyed Hossein Nasr, Science and Civilization in Islam (1968), has extensive material on al-Khwarizmi. For the intellectual setting of his era see "The Time of al-Khwarizmi" in volume 1 of George Sarton, Introduction to the History of Science (3 vols. in 5, 1927-1948).

 
Britannica Concise Encyclopedia: al-Khwarizmi

(born c. 780, Baghdad, Iraq — died c. 850) Muslim mathematician and astronomer. He lived in Baghdad during the golden age of Islamic science and, like Euclid, wrote mathematical books that collected and arranged the discoveries of earlier mathematicians. His Al-Kitab al-mukhtasar fi hisab al-jabr wa'l-muqabala ("The Compendious Book on Calculation by Completion and Balancing") is a compilation of rules for solving linear and quadratic equations, as well as problems of geometry and proportion. Its translation into Latin in the 12th century provided the link between the great Hindu and Arab mathematicians and European scholars. A corruption of the book's title resulted in the word algebra; a corruption of the author's own name resulted in the term algorithm.

For more information on al-Khwarizmi, visit Britannica.com.

 
Wikipedia: Muhammad ibn Mūsā al-Khwārizmī
"al-Khwārizmī" redirects here. For other uses, see al-Khwārizmī (disambiguation).
Muhammad ibn Mūsā al-Khwārizmī
Abu_Abdullah_Muhammad_bin_Musa_al-Khwarizmi_edit.png
A stamp issued September 6, 1983 in the Soviet Union, commemorating al-Khwārizmī's (approximate) 1200th anniversary.
Born c. 780
Died c. 850

Muḥammad ibn Mūsā al-Khwārizmī was a Persian[1] Shi'a Muslim mathematician, astronomer, astrologer and geographer. He was born around 780 in Khwārizm[2] (now Khiva, Uzbekistan) and died around 850. He worked most of his life as a scholar in the House of Wisdom in Baghdad.

His Algebra was the first book on the systematic solution of linear and quadratic equations. Consequently he is considered to be the father of algebra,[3] a title he shares with Diophantus. Latin translations of his Arithmetic, on the Indian numerals, introduced the decimal positional number system to the Western world in the 12th century.[4] He revised and updated Ptolemy's Geography as well as writing several works on astronomy and astrology.

His contributions not only made a great impact on mathematics, but on language as well. The word algebra is derived from al-jabr, one of the two operations used to solve quadratic equations, as described in his book. The words algorism and algorithm stem from algoritmi, the Latinization of his name.[5] His name is also the origin of the Spanish word guarismo[6] and of the Portuguese word algarismo, both meaning digit.

Biography

Few details about al-Khwārizmī's life are known; it is not even certain where he was born. His name indicates he might have come from Khwarezm (Khiva) in the Khorasan province of the Abbasid empire (now Xorazm Province of Uzbekistan).

His kunya is given as either Abū ʿAbd Allāh (Arabic: أبو عبد الله) or Abū Jaʿfar (أبو جعفر in Arabic).[7]

The historian al-Tabari gave his name as Muhammad ibn Musa al-Khwārizmī al-Majousi al-Katarbali (Arabic: محمد بن موسى الخوارزميّ المجوسيّ القطربّليّ). The epithet al-Qutrubbulli indicates he might instead have came from Qutrubbull, a small town near Baghdad. Regarding al-Khwārizmī's religion, Toomer writes:

Another epithet given to him by al-Ṭabarī, "al-Majūsī," would seem to indicate that he was an adherent of the old Zoroastrian religion. This would still have been possible at that time for a man of Iranian origin, but the pious preface to al-Khwārizmī's Algebra shows that he was an orthodox Muslim, so al-Ṭabarī's epithet could mean no more than that his forebears, and perhaps he in his youth, had been Zoroastrians.[8]

In Ibn al-Nadīm's Kitāb al-Fihrist we find a short biography on al-Khwārizmī, together with a list of the books he wrote[citation needed]. Al-Khwārizmī accomplished most of his work in the period between 813 and 833. After the Islamic conquest of Persia, Baghdad became the centre of scientific studies and trade, and many merchants and scientists, from as far as China and India traveled to this city--as such apparently so did Al-Khwārizmī. He worked in Baghdad as a scholar at the House of Wisdom established by Caliph al-Maʾmūn, where he studied the sciences and mathematics, which included the translation of Greek and Sanskrit scientific manuscripts.

Contributions

The frontispiece of Frederic Rosen's The Algebra of Mohammed ben Musa (1831)
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The frontispiece of Frederic Rosen's The Algebra of Mohammed ben Musa (1831)

His major contributions to mathematics, astronomy, astrology, geography and cartography provided foundations for later and even more widespread innovation in algebra, trigonometry, and his other areas of interest. His systematic and logical approach to solving linear and quadratic equations gave shape to the discipline of algebra, a word that is derived from the name of his 830 book on the subject, al-Kitab al-mukhtasar fi hisab al-jabr wa'l-muqabala (Arabic الكتاب المختصر في حساب الجبر والمقابلة) or: "The Compendious Book on Calculation by Completion and Balancing". The book was first translated into Latin in the twelfth century.

His book On the Calculation with Hindu Numerals written about 825, was principally responsible for the diffusion of the Indian system of numeration in the Middle-East and then Europe. This book also translated into Latin in the twelfth century, as Algoritmi de numero Indorum. From the name of the author, rendered in Latin as algoritmi, originated the term algorithm.

Some of his contributions were based on earlier Persian and Babylonian Astronomy, Indian numbers, and Greek sources.

Al-Khwārizmī systematized and corrected Ptolemy's data in geography as regards to Africa and the Middle east. Another major book was his Kitab surat al-ard ("The Image of the Earth"; translated as Geography), which presented the coordinates of localities in the known world based, ultimately, on those in the Geography of Ptolemy but with improved values for the length of the Mediterranean Sea and the location of cities in Asia and Africa.

He also assisted in the construction of a world map for the caliph al-Ma'mun and participated in a project to determine the circumference of the Earth, supervising the work of 70 geographers to create the map of the then "known world".[9]

When his work was copied and transferred to Europe through Latin translations, it had a profound impact on the advancement of basic mathematics in Europe. He also wrote on mechanical devices like the astrolabe and sundial.

Algebra

Main article: The Compendious Book on Calculation by Completion and Balancing
A page from al-Khwārizmī's Algebra
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A page from al-Khwārizmī's Algebra

al-Kitāb al-mukhtaṣar fī ḥisāb al-jabr wa-l-muqābala (Arabic: الكتاب المختصر في حساب الجبر والمقابلة “The Compendious Book on Calculation by Completion and Balancing”) is a mathematical book written approximately 830 CE.

The word algebra is derived from the name of one of the basic operations with equations (al-jabr) described in this book. The book was translated in Latin as Liber algebrae et almucabala by Robert of Chester (Segovia, 1145)[10] hence "algebra", and also by Gerard of Cremona. A unique Arabic copy is kept at Oxford and was translated in 1831 by F. Rosen. A Latin translation is kept is Cambridge.[11]

Al-Khwārizmī's method of solving linear and quadratic equations worked by first reducing the equation to one of six standard forms (where b and c are positive integers)

  • squares equal roots (ax² = bx)
  • squares equal number (ax² = c)
  • roots equal number (bx = c)
  • squares and roots equal number (ax² + bx = c)
  • squares and number equal roots (ax² + c = bx)
  • roots and number equal squares (bx + c = ax²)

by dividing out the coefficient of the square and using the two operations al-ǧabr (Arabic: الجبر “restoring” or “completion”) and al-muqābala ("balancing"). Al-ǧabr is the process of removing negative units, roots and squares from the equation by adding the same quantity to each side. For example, x² = 40x - 4x² is reduced to 5x² = 40x. Al-muqābala is the process of bringing quantities of the same type to the same side of the equation. For example, x²+14 = x+5 is reduced to x²+9 = x.

Several authors have published texts under the name of Kitāb al-ǧabr wa-l-muqābala, including Abū Ḥanīfa al-Dīnawarī, Abū Kāmil (Rasāla fi al-ǧabr wa-al-muqābala), Abū Muḥammad al-ʿAdlī, Abū Yūsuf al-Miṣṣīṣī, Ibn Turk, Sind ibn ʿAlī, Sahl ibn Bišr (author uncertain), and Šarafaddīn al-Ṭūsī.

Arithmetic

Page from a Latin translation, beginning with "Dixit algorizmi"
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Page from a Latin translation, beginning with "Dixit algorizmi"

Al-Khwārizmī's second major work was on the subject of arithmetic, which survived in a Latin translation but was lost in the original Arabic. The translation was most likely done in the 12th century by Adelard of Bath, who had also translated the astronomical tables in 1126.

The Latin manuscripts are untitled, but are commonly referred to by the first two words with which they start: Dixit algorizmi ("So said al-Khwārizmī"), or Algoritmi de numero Indorum ("al-Khwārizmī on the Hindu Art of Reckoning"), a name given to the work by Baldassarre Boncompagni in 1857. The original Arabic title was possibly Kitāb al-Jamʿ wa-l-tafrīq bi-ḥisāb al-Hind[12] ("The Book of Addition and Subtraction According to the Hindu Calculation")[13]


Geography

Hubert Daunicht's reconstruction of al-Khwārizmī's planisphere.
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Hubert Daunicht's reconstruction of al-Khwārizmī's planisphere.
A 15th century map based on Ptolomy's Geography for comparison.
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A 15th century map based on Ptolomy's Geography for comparison.

Al-Khwārizmī's third major work is his Kitāb ṣūrat al-Arḍ (Arabic: كتاب صورة الأرض "Book on the appearance of the Earth" or "The image of the Earth" translated as Geography), which was finished in 833. It is a revised and completed version of Ptolemy's Geography, consisting of a list of 2402 coordinates of cities and other geographical features following a general introduction.[14]

There is only one surviving copy of Kitāb ṣūrat al-Arḍ, which is kept at the Strasbourg University Library. A Latin translation is kept at the Biblioteca Nacional de España in Madrid. The complete title translates as Book of the appearance of the Earth, with its cities, mountains, seas, all the islands and rivers, written by Abu Ja'far Muhammad ibn Musa al-Khwārizmī, according to the geographical treatise written by Ptolemy the Claudian.[15]

The book opens with the list of latitudes and longitudes, in order of "weather zones", that is to say in blocks of latitudes and, in each weather zone, by order of longitude. As Paul Gallez points out, this excellent system allows us to deduce many latitudes and longitudes where the only document in our possession is in such a bad condition as to make it practically illegible.

Neither the Arabic copy nor the Latin translation include the map of the world itself, however Hubert Daunicht was able to reconstruct the missing map from the list of coordinates. Daunicht read the latitudes and longitudes of the coastal points in the manuscript, or deduces them from the context where they were not legible. He transferred the points onto graph paper and connected them with straight lines, obtaining an approximation of the coastline as it was on the original map. He then does the same for the rivers and towns.[16]


Astronomy

Corpus Christi College MS 283
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Corpus Christi College MS 283

Al-Khwārizmī's Zīj al-sindhind (Arabic: زيج "astronomical tables") is a work consisting of approximately 37 chapters on calendrical and astronomical calculations and 116 tables with calendrical, astronomical and astrological data, as well as a table of sine values. This is one of many Arabic zijes based on the Indian astronomical methods known as the sindhind.[17]

The original Arabic version (written c. 820) is lost, but a version by the Spanish astronomer Maslama al-Majrīṭī (c. 1000) has survived in a Latin translation, presumably by Adelard of Bath (January 26, 1126).[18] The four surviving manuscripts of the Latin translation are kept at the Bibliothèque publique (Chartres), the Bibliothèque Mazarine (Paris), the Bibliotheca Nacional (Madrid) and the Bodleian Library (Oxford).

Jewish calendar

Al-Khwārizmī wrote several other works including a treatise on the Hebrew calendar (Risāla fi istikhrāj taʾrīkh al-yahūd "Extraction of the Jewish Era"). It describes the 19-year intercalation cycle, the rules for determining on what day of the week the first day of the month Tishrī shall fall; calculates the interval between the Jewish era (creation of Adam) and the Seleucid era; and gives rules for determining the mean longitude of the sun and the moon using the Jewish calendar. Similar material is found in the works of al-Bīrūnī and Maimonides.

Other works

Several Arabic manuscripts in Berlin, Istanbul, Taschkent, Cairo and Paris contain further material that surely or with some probability comes from al-Khwārizmī. The Istanbul manuscript contains a paper on sundials, which is mentioned in the Fihirst. Other papers, such as one on the determination of the direction of Mecca, are on the spherical astronomy.

Two texts deserve special interest on the morning width (Maʿrifat saʿat al-mashriq fī kull balad) and the determination of the azimuth from a height (Maʿrifat al-samt min qibal al-irtifāʿ).

He also wrote two books on using and constructing astrolabes. Ibn al-Nadim in his Kitab al-Fihrist (an index of Arabic books) also mentions Kitāb ar-Ruḵāma(t) (the book on sundials) and Kitab al-Tarikh (the book of history) but the two have been lost.

See also

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Notes

  1. ^ Toomer, Hogendijk 1997, Oaks
  2. ^ Berggren, Hogendijk, Struik p. 93
  3. ^ Gandz 1936
  4. ^ Struik p. 93
  5. ^ al-Daffa 1978
  6. ^ *Donald E. Knuth, Algorithms in Modern Mathematics and Computer Science. Springer-Verlag. 1979. ISBN 0-387-11157-3.
  7. ^ possibly because it is mistaken with that of Ǧaʿfar Muḥammad ibn Mūsā ibn Šākir. M. Dunlop. Muḥammad b. Mūsā al-Khwārizmī. JRAS 1943 p. 248-250).
  8. ^ Toomer
  9. ^ Encyclopedia Britannica. al-Khwarizmi.
  10. ^ mactutor-hanasi
  11. ^ L. C. Karpinski (1912). "History of Mathematics in the Recent Edition of the Encyclopædia Britannica". American Association for the Advancement of Science.
  12. ^ Ruska 1917
  13. ^ Berggren, p. 7
  14. ^ MacTutor: Cartography
  15. ^ In al-Khwārizmī's opinion, "the Claudian" indicated that Ptolemy was a descendent of the emperor Claudius.
  16. ^ Daunicht 1968
  17. ^ Kennedy, Islamic Astronomical Tables, pp. 26-9
  18. ^ Neugebauer 1962

Further reading

  • Berggren, J. Lennart (1986). Episodes in the Mathematics of Medieval Islam. New York: Springer-Verlag. ISBN 0-387-96318-9. 
  • Daffa', Ali Abdullah al- (1977). The Muslim contribution to mathematics. London: Croom Helm. ISBN 0-85664-464-1. 
  • Daunicht, Hubert (1968–1970). Der Osten nach der Erdkarte al-Ḫuwārizmīs : Beiträge zur historischen Geographie und Geschichte Asiens (in German). Bonner orientalistische Studien. N.S. ; Bd. 19. LCCN 71-468286. 
  • Dunlop, Douglas Morton (1943). "Muhammad ibn-Musa al-Khwarizmi". Journal of the Royal Asiatic Society of Great Britain & Ireland: 248–250. 
  • Folkerts, Menso (1997). Die älteste lateinische Schrift über das indische Rechnen nach al-Ḫwārizmī (in German and Latin). München: Bayerische Akademie der Wissenschaften. ISBN 3-7696-0108-4. 
  • Gandz, Solomon (November 1926). "The Origin of the Term "Algebra"". The American Mathematical Monthly 33 (9): 437–440. ISSN 0002-9890. 
  • Gandz, Solomon (1936). "The Sources of al-Khowārizmī's Algebra". Osiris 1: 263–277. ISSN 0369-7827. 
  • Gandz, Solomon (1938). "The Algebra of Inheritance: A Rehabilitation of Al-Khuwārizmī". Osiris 5: 319–391. ISSN 0369-7827. 
  • Hogendijk (1991). "Al-Khwārizmī's Table of the "Sine of the Hours" and the Underlying Sine Table". Historia Scientiarum 42: 1–12. 
  • Hogendijk, Jan P. (1998). "al-Khwarzimi". Pythagoras 38 (2): 4–5. ISSN 0033-4766. 
  • Hughes, Barnabas B. (1986). "Gererd of Cremona's Translation of al-Khwārizmī's al-Jabr: A Critical Edition". Mediaeval Studies 48: 211–263. 
  • Barnabas Hughes. Robert of Chester's Latin translation of al-Khwarizmi's al-Jabr: A new critical edition. In Latin. F. Steiner Verlag Wiesbaden (1989). ISBN 3-515-04589-9.
  • Karpinski, L. C. (1915). Robert of Chester's Latin Translation of the Algebra of Al-Khowarizmi, with an Introduction, Critical Notes and English Version. The Macmillan Company. 
  • Kennedy, E.S. (1956). A Survey of Islamic Astronomical Tables; Transactions of the American Philosophical Society. Philadelphia: American Philosophical Society, 46(2). 
  • Kennedy, E. S. (1964). "Al-Khwārizmī on the Jewish Calendar". Scripta Mathematica 27: 55–59. 
  • King, David A. (1983). Al-Khwārizmī and New Trends in Mathematical Astronomy in the Ninth Century. New York University: Hagop Kevorkian Center for Near Eastern Studies: Occasional Papers on the Near East 2. LCCN 85-150177. 
  • Mžik, Hanz von (1926). Das Kitāb Ṣūrat al-Arḍ des Abū Ǧa‘far Muḥammad ibn Mūsā al-Ḫuwārizmī. 
  • Neugebauer, Otto (1962). The Astronomical Tables of al-Khwarizmi.  Historisk-filosofiske Skrifter. Bind 4, nr. 2.
  • Jeffrey A. Oaks. Was al-Khwarizmi an applied algebraist?. The University of Indianapolis.
  • O'Connor, John J; Edmund F. Robertson "Abu Ja'far Muhammad ibn Musa Al-Khwarizmi". MacTutor History of Mathematics archive.  
  • O'Connor, John J; Edmund F. Robertson "Abraham bar Hiyya Ha-Nasi". MacTutor History of Mathematics archive.  
  • O'Connor, John J; Edmund F. Robertson "Arabic mathematics: forgotten brilliance?". MacTutor History of Mathematics archive.  
  • Roshdi Rashed, The development of Arabic mathematics: between arithmetic and algebra, London, 1994.
  • Rosen, Fredrick (2004-09-01). The Algebra of Mohammed Ben Musa. Kessinger Publishing. ISBN 1-4179-4914-7. 
  • Rosenfeld, Boris A. (1993). ""Geometric trigonometry" in treatises of al-Khwārizmī, al-Māhānī and Ibn al-Haytham". Vestiga mathematica: Studies in Medieval and Early Modern Mathematics in Honour of H. L. L. Busard. Amsterdam: Rodopi. ISBN 90-5183-536-1. 
  • Julius Ruska. Zur ältesten arabischen Algebra und Rechenkunst. ISBN 3-533-03817-3.
  • Fuat Sezgin. Geschichte des arabischen Schrifttums. 1974, E. J. Brill, Leiden, the Netherlands.
  • Sezgin, F., ed., Islamic Mathematics and Astronomy, Frankfurt: Institut für Geschichte der arabisch-islamischen Wissenschaften, 1997-9.
  • Struik, Dirk Jan (1987). A Concise History of Mathematics, 4th, Dover Publications. ISBN 0486602559. 
  • Suter, H. [Ed.]: Die astronomischen Tafeln des Muhammed ibn Mûsâ al-Khwârizmî in der Bearbeitung des Maslama ibn Ahmed al-Madjrîtî und der latein. Übersetzung des Athelhard von Bath auf Grund der Vorarbeiten von A. Bjørnbo und R. Besthorn in Kopenhagen. Hrsg. und komm. Kopenhagen 1914. 288 pp. Repr. 1997 (Islamic Mathematics and Astronomy. 7). ISBN 3-8298-4008-X.
  • Toomer, Gerald (1970–1990). "Al-Khwārizmī, Abu Jaʿfar Muḥammad ibn Mūsā". Dictionary of Scientific Biography 7. Ed. Charles Coulston Gillispie. New York: Charles Scribner's Sons. 358–365. ISBN 0-684-16962-2. 
  • Van Dalen, B. Al-Khwarizmi's Astronomical Tables Revisited: Analysis of the Equation of Time.

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