61. Thabit Ibn Qurrah (Thebit), 836-901 C.E. thabit ibn QURRAH (THEBIT) thabit ibn Qurrah, known in the West as Thebit, is knownfor his work on mechanics, astronomy, pure mathematics and geometry. http://www.unhas.ac.id/~rhiza/saintis/qurra.html

THABIT IBN QURRAH (THEBIT) (836 - 901 C.E.) by Dr. A. Zahoor Thabit ibn Qurrah, known in the West as Thebit , is known for his work on mechanics, astronomy, pure mathematics and geometry. Thabit ibn Qurrah ibn Marwan al-Harrani was born in 836 C.E. at Harran (present Turkey) and died in Baghdad in 901 C.E. He joined the scientific team of the great Muslim mathematician Muhammad Ibn Musa Ibn Shakir at Baghdad, which was established by the Abbasid Caliphs. Thabit was a pioneer in extending the concept of traditional geometry to geometrical algebra and proposed theories that led to the development of non-Euclidean geometry, spherical trigonometry, integral calculus and real numbers. He used arithmetic terminology to study several aspects of conic sections (parabola and ellipse). His algorithm for computing the surface area and volume of solids is in fact what we came to know later as the integral calculus. Thabit's original work on Mechanics and Physics involves examining conditions of equilibrium of bodies, beams and levers. Some historians have recognized him as the Founder of Statics. He was among the early critics of Ptolemaic views on astronomy. He also criticized several theorems of Euclid's elements and proposed important improvements. Thabit added the ninth sphere to Ptolemic astronomy. Some early investigators criticized his work on 'Trepidation of Equinoxes' and several centuries later Tycho Brahe (1546-1601) improved upon his work. Thabit analyzed several problems on the movements of sun and moon and wrote treatises on sundials. Beer and Madler in their famous work Der Mond (1837) mention a surface feature of the moon after Thabit (Thebit). It is a prominent circular plain thirty miles in diameter in Section No. 8. The intrusion of a small circular plain has disfigured its circular wall. A small crater has thrust itself in on the eastern side of this plain.

62. Thabit Ibn Qurra - Wikipedia, The Free Encyclopedia thabit ibn qurra. thabit ibn qurra abu l Hasan ibn Marwan alSabi al Harrani,(826 - February 18, 901) was an Arab astronomer and mathematician. http://www.peacelink.de/keyword/Thabit_ibn_Qurra.php

Not logged in Log in Help Thabit ibn Qurra This is NOT the Wikipedia - The content is from the Wikipedia sl:Tabit ibn Kora Thabit ibn Qurra abu' l'Hasan ibn Marwan al-Sabi al'Harrani February 18 ) was an Arab astronomer and mathematician . In Latin he was known as Thebit Thabit was born in Harran (antique Carrhae), Mesopotamia (now Turkey ). Upon the proposal of Muhammad ibn Musa ibn Shakir Thabit went to study in Baghdad to Shakir's brothers the Bani Mussa. He led a group of translators, who came from the pagan pseudo Sabeans from Harran. Arabic writters confound the Babylonian Sabeans from the Harrarian Sabeans. Harrarian Sabeans respected stars and for this reason they have very soon showed a great interests for astronomy and mathematics . In the times of Muslim supremacy they have accepted the name Sabean to get benefits from privileges that were allowed by the Ko'ran . This name later ramained and this strange sect have lived in vicinity of the main center of the Caliphate till the half of the 13th century , when the Mongols have destroyed their last shrine. Their merits in the spiritual and scientifical fields have with no doubt helped them to get a protection from the

63. Loq-Man Translations above. There they worked with Hunayn and later also with thabit ibn qurra.Hunayn became thabit ibn qurra (836 901). thabit ibn qurra http://www.loqmantranslations.com/ArabicFacts/ArabTranslators.html

ARAB TRANSLATORS Home Sitemap Company About us Services Translation Software Localization ... Consulting Translators Forum Translator's Form Translator's Help Contact Us Abu Zayd Hunayn ibn Ishaq al-Ibadi (808 - 873) Hunayn ibn Ishaq is most famous as a translator. He was not a mathematician but trained in medicine and made his original contributions to the subject. However, as the leading translator in the House of Wisdom at one of the most remarkable periods of mathematical revival, his influence on the mathematicians of the time is of sufficient importance to merit his inclusion in this archive. His son Ishaq ibn Hunayn, strongly influenced by his father, is famed for his Arabic translation of Euclid's Elements. Hunayn's father was Ishaq, a pharmacist from Hira. The family were from a group who had belonged to the Syrian Nestorian Christian Church before the rise of Islam, and Hunayn was brought up as a Christian. Hunayn became skilled in languages as a young man, in particular learning Arabic at Basra and also learning Syriac. To continue his education Hunayn went to Baghdad to study medicine under the leading teacher of the time. However, after falling out with this teacher, Hunayn left Baghdad and, probably during a period in Alexandria, became an expert in the Greek language. Hunayn returned to Baghdad and established contact with the teacher with whom he had fallen out. The two became firm friends and were close collaborators on medical topics for many years.

64. Encyclopedia: Thabit Ibn Qurra alMarja.comthabit ibn QURRAH (THEBIT) (836 - 901 CE). thabit ibn Qurrah, known inthe West as Thebit, is known for his work on mechanics, astronomy http://www.nationmaster.com/encyclopedia/Thabit-ibn-Qurra

Supporter Benefits Signup Login Sources ... Pies Factoid #60 Russia won the first World Air Games , held in Turkey in 1997. Events included hang-gliding, sky-surfing, and ballooning. Interesting Facts Make your own graph: Hold down Control and click on several. Compare All Top 5 Top 10 Top 20 Top 100 Bottom 100 Bottom 20 Bottom 10 Bottom 5 All (desc) in category: Select Category Agriculture Crime Currency Democracy Economy Education Energy Environment Food Geography Government Health Identification Immigration Internet Labor Language Manufacturing Media Military Mortality People Religion Sports Taxation Transportation Welfare with statistic: view: Correlations Printable graph / table Pie chart Scatterplot with ... * Asterisk means graphable. Added May 21 Mortality stats Multi-users ½ price Catholic stats Top Graphs Richest Most Murderous Most Populous Most Militaristic ... More Stats Categories Agriculture Background Crime Currency ... Welfare Updated: Nov 21, 2003 Encyclopedia : Thabit ibn Qurra Thabit ibn Qurra abu' l'Hasan ibn Marwan al-Sabi al'Harrani February 18 ) was an Arab astronomer and mathematician. In Latin he was known as Thebit Thabit was born in Harran (antique Carrhae)

65. Islam thabit ibn qurra (826-901) et suscitéespar les besoins de la nouvelle société, en astronomie, en optique, en http://www.cerimes.fr/e_doc/nombre/islam.htm

Islam ... Ainsi s'exprime le barbier dans Les Mille et Une Nuits Thabit ibn Qurra Muhammad ibn Musa al-Khwarizmi Kitab al-jabr wa al-muqabala dans lequel al-jabr et al-muqabal racine ou chose Ibn Turk Thabit ibn Qurra , revient aux Suite Occident

66. Collection De Nombres, Nombres Amiables Et Sociables, Suite Aliquote a été établi par un brillant mathématicien musulman thabit ibn qurra. http://membres.lycos.fr/villemingerard/Decompos/Amiable.htm

Accueil Dictionnaire Rubriques Index ... M'écrire Édition du: SOS je suis Débutant Rubrique: Nombres Présentation Parfait Presque parfait Amiables ... Sublimes Sommaire de cette page NOMBRE AMIABLES ET SOCIABLES HISTORIQUE LISTE DES NOMBRES AMIABLES À 5 CHIFFRES PROPRIÉTÉS CRITÈRE DE THABIT TRIPLET AMIABLES NOMBRES SOCIABLES OU CHAÎNES AMIABLES HISTORIQUE ET RECORDS CHAÎNE ALIQUOTE Pages voisines Nombres économes, équidistants et prodigues Théorie des nombres Calcul mental Géométrie NOMBRES AMIABLES ET SOCIABLES ou Nombres Amicaux sortes de nombres parfaits mutuels Il sont très rares On en connaît une centaine seulement Anglais : Amicable numbers NOMBRE AMIABLES ET SOCIABLES Chaque nombre est la somme des diviseurs propres de l'autre Le nombres amiables et sociables sont une généralisation de la notion de nombres parfaits. Exemple Paires Diviseurs propres 1, 2, 4, 5, 10, 11, 20, 22, 44, 55 et 110 1, 2, 4, 71 et 142 Somme des diviseurs et 284 forment la première paire amiable On note Paires Diviseurs propres 1, 2, 4, 5, 10, 11, 20, 22, 44, 55 et 110 1, 2, 4, 71 et 142

67. Al-andalus ibn thabit qurra, ou le travail d ibnAflah, Abu l-Wafa, et ibn thabit qurra peut tout soit basé sur quelque http://membres.lycos.fr/andalus/savants/aflah.htm

Dates importantes Début de l'histoire Omeyyades d'Espagne Emirs Omeyyades ... Effondrement Ibn Jabir Aflah Ibn Jabir Aflah est souvent connu par la forme Latin de son nom, à savoir Geber . Bien qu'il ne soit pas le meilleur mathématiciens arabes, il est plus connu depuis que ses travaux ont été traduits dans le latin, et que donc ces traveaux ont été étudiés par les mathématiciens européens. Peu de renseignements sont disponible concernant la vie de ibn Jabir d'Aflah . On sait qu'il est d'origine Andalous ,de Séville parcequ'on le surnomme " al - Ishbili " qui veut dire " de Séville ". Ibn Jabir Aflah a inventé un instrument d'observation connu comme le torquetum, un appareil mécanique qui permet la transformation entre systèmes de coordonnée sphériques . Il a aussi donné son nom à un théorème dans la trigonométrie sphérique, et ses critiques de l'Almagest de P t olémée sont bien connues. Ces critiques paraissent dans ibn Jabir le travail le plus célèbre d'Aflah "

68. Arabic Numerals Ibrahim ibn Sinan ibn thabit ibn qurra (908946) who introduced a methodof integration in studying the quadrature of the parabola. http://www.arabicnumerals.cwc.net/

By M Erhayiem The IBM World Book Encyclopaedia raises the question as how the Arabic Numerals originated (!?) as appeared in an article contributed by Nadine L. Verderber, Ph.D., Prof. of Mathematics, Southern Illinois Univ., Edwardsville. The article states, as such, "Scholars do not know how Arabic numerals originated." "The Hindus developed the zero sometime after A.D. 600." The World Book Multimedia Encyclopaedia has largely ignored the work of the Scientists during the Islamic and the Arabic medieval era. The contributions of the Muslims and Arabs in the field of Mathematics were very significant. The great Harvard historian of science, Professor George Sarton wrote in his monumental Introduction to the History of Science[4]: "From the second half of the 8th to the end of the 11th century, Arabic was the scientific, the progressive language of mankind... When the West was sufficiently mature to feel the need of deeper knowledge, it turned its attention, first of all, not to the Greek sources, but to the Arabic ones." O'Connor and Robertson[2] published various articles about the contribution of those forgotten brilliance. Muhammad ibn Musa al-Khawarizmi Yaqub ibn Ishaq al-Kindi (801-873 A.D.), a Philosopher and Mathematician, who wrote many works on arithmetic, including: the numbers, relative quantities, measuring proportion and time, and numerical procedures. He also wrote on space and time.

69. De Imaginibus De Imaginibus thabit ibn qurra. Written entirely in Latin (translatedfrom Arabic). An ancient Arabic Miscellenie of vast power. Reported http://mywebpages.comcast.net/cwood163633/Ars Magica/Library/Imaginibus.htm

De Imaginibus Thabit Ibn Qurra Written entirely in Latin (translated from Arabic) An ancient Arabic Miscellenie of vast power. Reported to contain experiments on how to arouse hatred and friendship, become ruler of a realm, and how to destroy cities and regions. Our crumbing scrolls, written in Arabic with Latin translation alongside, contain the opening fragment of this work: Scroll Art Spell Title, Author, promise that these 20 enchantments can turn a mage into a king. Subtle Shift of Heart Rising Ire Aura of Rightful Authority Return to the Stacks

70. Al-Khayyam E Le Eq Di III Translate this page Occorre citare tra essi thabit ibn-qurra , medico, filosofo e astronomo oltre chescienziato, vissuto a Baghdad nel IX secolo, che fornì la risoluzione di http://www.iisalessandrini.it/progetti/medioevo/eq3gr.htm

TECNOLOGIA E SCIENZA NELL'ETA' MEDIEVALE QUADRO STORICO LA CONQUISTA ARABA LA RINASCITA CULTURALE TECNICA E ARTIGIANATO ALTO MEDIOEVO BASSO MEDIOEVO ISLAM MEDIEVALE SISTEMA CULTURALE ... CONQUISTE TECNICHE Omar Khayyam e le equazioni di 3° grado IX secolo X secolo XI secolo XII secolo ... , l'opera poetica di Khayyam Molti furono gli scienziati arabi che dopo Al-Khuwarizmi si dedicarono alla soluzione delle equazioni per via aritmetica e geometrica. Occorre citare tra essi Thabit ibn-Qurra , medico, filosofo e astronomo oltre che scienziato, vissuto a Baghdad nel IX secolo, che fornì la risoluzione di alcuni casi di equazioni di 3° grado ma scoprì anche una formula sui numeri ‘amicabili’ (due numeri sono amicabili se ciascuno di essi è la somma dei divisori dell’altro) e dimostrò un teorema che generalizza quello di Pitagora (e che si può applicare a tutti i triangoli). Thabit fondò una scuola araba di traduttori : a lui si debbono le traduzioni in arabo delle opere di Euclide, Archimede, Apollonio e Tolomeo. Un secolo più tardi, uno dei maggiori esponenti della matematica araba fu Omar Khayyam, soprannominato ‘fabbricatore di tende’, ricordato in oriente per le sue scoperte scientifiche ma più famoso in Occidente come uno dei maggiori poeti persiani. Il suo contributo più significativo all’algebra fu una trattazione generale delle

71. Blog Matematico Translate this page Il grande matematico arabo Al-Sabi thabit ibn qurra al-Harrani (826-901) dimostròil notevole teorema fissato n intero positivo, se i numeri p = 3 2 n-1 - 1 http://alpha01.dm.unito.it/personalpages/cerruti/aprile-maggio-03.html

Blog Matematico di Umberto Cerruti E' possibile consultare l' archivio degli articoli precedenti. Math News Home 31 maggio 2003 Numeri amicali Due interi positivi m,n si dicono amicali (in inglese amicable ) se: s (m) = s (n) = m + n dove s (x) è la somma di tutti i divisori di x Se definiamo la funzione f(x): f(x) = somma dei divisori di x minori di x equivalentemente f(x) = s (x) - x allora m,n sono amicali se e solo se n = f(m) m = f(n) La prima coppia di numeri amicali che si incontra è (220, 284). Infatti: f(220) = 1 + 2 + 4 + 5 + 10 + 11 + 20 + 22 + 44 + 55 + 110 = 284 f(284) = 1 + 2 + 4 + 71 + 142 = 220 Questa coppia era nota già a Pitagora, e forse prima. Il grande matematico arabo Al-Sabi Thabit ibn Qurra al-Harrani (826-901) dimostrò il notevole teorema: fissato n intero positivo, se i numeri: p = 3 2 n-1 - 1 q = 3 2 n - 1 r = 9 2 - 1 sono tre primi dispari, allora la coppia (a,b) con a = 2 n pq e b = 2 n r è una coppia di numeri amicali Si tengano a mente due fatti: 1) dato un certo n si ottiene una coppia amicale solo se p, q, r sono tutti primi 2) non tutte le coppie amicali provengono da questo teorema; per esempio (1184, 1210) non si trova.

72. The University Of Illinois At Chicago Department Of Classics And Mediterranean S Forthcoming Publications With Amos Bertolacci, thabit ibn qurra s Concise Expositionof Aristotle s Metaphysics Text, Translation, Commentary, in thabit http://www.uic.edu/las/clas/David_Reisman.html

Previous Faculty List Next David C. Reisman , BA, MA (1993, Boston University), PhD (2001, Yale University) Assistant Professor of Arabic-Islamic Thought Areas of Research and Publication: Medieval Arabic-Islamic Philosophy (particularly Avicenna and the Avicennan Tradition); Graeco-Arabic translation movement in medieval Islam (social and political contexts); Arabic history and historiography (Mamluk period); Arabic codicology and paleaography; medieval Arabic grammar and literary theory. Recent Publications: The Making of the Avicennan Tradition: The Transmission, Contents, and Structure of Ibn Sina's al-Mubahathat (The Discussions) , Leiden: Brill, 2002. "Avicenna at the ARCE," in R. Wisnovsky, ed. Aspects of Avicenna (Princeton Papers: Interdiscplinary Journal of Middle Eastern Studies, vol. 10), Princeton, N.J.: Markus Wiener, 2000, pp. 131-182. "Miskawayh's Ethics in Andalus? (Philologica Arabica I)," Yale University Library Gazette , Supplement 4 (1999), pp. 1-7. "Ibn al-Athir,"

73. The Time Of Al-razi IBRAHIM ibn SINAN Abu Ishaq Ibrahim ibn Sinan ibn thabit ibn qurra.Born in 9089, died in 946. Grandson of thabit ibn qurra (qv http://www.alchemywebsite.com/islam15.html

This is the mirror of the alchemy web site www.levity.com/alchemy History of Islamic Science 4 Based on the book Introduction to the History of Science by George Sarton (provided with photos and portraits) Edited and prepared by Prof. Hamed A. Ead These pages are edited by Prof. Hamed Abdel-reheem Ead, Professor of Chemistry at the Faculty of Science -University of Cairo, Giza, Egypt and director of the Science Heritage Center E-mail: ead@frcu.eun.eg Web site: http://www.frcu.eun.eg/www/universities/html/hamed2.htm Back to Islamic Alchemy The Time of Al-Mas'udi First Half of Tenth Century The overwhelming superiority of Muslim culture continued to be felt throughout the tenth century. Indeed, it was felt more strongly than over, not only the foremost men of science were Muslims, but also because cultural influences are essentially cumulative. By the beginning, or at any rate by the middle of the century, the excellence of muslim science was already so well established, even in the West, that each new arabic work benefited to some extent by the prestige pertaining to all. To be sure, other languages, such as Latin, Greek, or Hebrew were also used by scholars, but the works written in those languages contained nothing new, and in the field of science, as in any other, when one ceases to go forward, one already begins to go backward. All the new discoveries and the new thoughts were published in arabic. strangely enough, the language of the Qur'an had thus become the international vehicle of scientific progress.

74. The Time Of Al-razi thabit ibn qurra Abu Hassan thabit ibn qurra Marawan alHarrani, that is, from Harran,Mesopotamia, born 826-27 (or 835-36), flourished in Bagdad, died in 901. http://www.alchemywebsite.com/islam14.html

This is the mirror of the alchemy web site www.levity.com/alchemy History of Islamic Science 3 Based on the book Introduction to the History of Science by George Sarton (provided with photos and portraits) Edited and prepared by Prof. Hamed A. Ead These pages are edited by Prof. Hamed Abdel-reheem Ead, Professor of Chemistry at the Faculty of Science -University of Cairo, Giza, Egypt and director of the Science Heritage Center E-mail: ead@frcu.eun.eg Web site: http://www.frcu.eun.eg/www/universities/html/shc/index.htm Back to Islamic Alchemy Back to reference library The Time of Al-Razi Second Half of Ninth Century The whole ninth century was essentially a Muslim century. This more clear in the second half than of the first, since all the scientific leaders were Muslims, or at any rate were working with and for Muslims and wrote in Arabic. Cultural Background Abbasid Caliph Al-Mutawakkil (847-861) continued to protect men of science, chiefly the physicians, and he encouraged the school of translators headed by Hunain ibn Ishaq. Da ud al-Zahiri founded a new school of theology, based upon a more literal interpretation of the Qur'an; however, did not survive very long. Muslim published a new collection of traditions, arranged according to legal topics, like Bukhari's, but more theoretical.

75. The Garden Of Archimedes: Pythagoras scheda3_1.gif, The demonstration of thabit ibn qurra. The following demonstrationis attributed to the Arab mathematician thabit ibn qurra (826901). http://www.math.unifi.it/archimede/archimede_inglese/pitagora/exh_pitagora/sched

The Garden of Archimedes A Museum for Mathematics Pythagoras and his Theorem Another very simple demonstration. visual demonstration and Airy's explanation demonstration of Thabit Ibn Qurra The white area with the two yellow triangles forms the square of the hypothenuse, while with the two green triangles, equal to the previous ones, gives the squares of the cathets. Naturally, even here the visual evidence must be supported by a demonstration, which can be performed by anybody. It seems that the previous demonstration was found in 1855 by G. B. Airy , the Greenwich observatory astronomer from 1836 to 1881. In the white part of the figure, Airy wrote the poem that follows: I am, as you may see, a + b When two triangles on me stand, But if I stand on them instead, The squares of both sides are read. The demonstration of Thabit Ibn Qurra. The following demonstration is attributed to the Arab mathematician Thabit Ibn Qurra (826-901). Starting from the right angled triangle ABC we make an irregular polygon ABDGLA by adding to the triangle the squares on the cathets ALHC and CBDE and the rectangle HCEG. This last one is divided by the diagonal GC in two right angled triangles, equal to the triangle ABC. Let now LI equal to BC and FD equal to AC; also the triangles ALI and BFD are equal to ABC. The same is true for the triangle IGF, because we have GI=AC and GF=BC. .

76. Il Giardino Di Archimede: Pitagora Translate this page scheda3_1.gif, La dimostrazione di thabit ibn qurra. La dimostrazione seguenteè attribuita al matematico arabo thabit ibn qurra (826-901). http://www.math.unifi.it/archimede/archimede/pitagora/exh_pitagora/scheda3.html

Il giardino di Archimede Un museo per la matematica Pitagora e il suo teorema Un'altra dimostrazione semplicissima. dimostrazione visiva e spiegazione di Airy dimostrazione di Thabit Ibn Qurra La Sembra I am, as you may see, a + b When two triangles on me stand, But if I stand on them instead, The squares of both sides are read. Mi presento, signori, eccomi qui: a + b Con due triangoli sopra, chiedo scusa* Ma se questi di sotto stanno quieti Si formano i quadrati dei cateti. *Di "chiedo scusa", amici, chiedo scusa, non ho la rima dell’ipotenusa ... La dimostrazione di Thabit Ibn Qurra. Pagina principale Pitagora e il suo teorema Pagina precedente Pagina successiva ... Links

77. Mathem_abbrev Diadochus Prony, Gaspard de Ptolemy Pythagoras of Samos Qadi Zada, alRumi Qalasadi,Abu l al Quhi, Abu al Quillen, Daniel Quine, Willard qurra, thabit ibn. http://www.pbcc.cc.fl.us/faculty/domnitcj/mgf1107/mathrep1.htm

Mathematician Report Index Below is a list of mathematicians. You may choose from this list or report on a mathematician not listed here. In either case, you must discuss with me the mathematician you have chosen prior to starting your report. No two students may write a report on the same mathematician. I would advise you to go to the library before choosing your topic as there might not be much information on the mathematician you have chosen. Also, you should determine the topic early in the term so that you can "lock-in" your report topic!! The report must include: 1. The name of the mathematician. 2. The years the mathematician was alive. 3. A biography. 4. The mathematician's major contribution(s) to mathematics and an explanation of the importance. 5. A historical perspective during the time the mathematician was alive. Some suggestions on the historical perspective might be: (a) Any wars etc. (b) Scientific breakthroughs of the time (c) Major discoveries of the time (d) How did this mathematician change history etc.

78. HPS: Paper 1: Centres Of Excellence - 5. Baghdad thabit ibn qurra of Harran; Revised each others translations. GreekArabic byIshaq ibn Hunayn, revised by thabit ibn qurra, c.892 clear and unambiguous. http://www.hps.cam.ac.uk/readinglists/p1psme-5.html

window.defaultStatus="Department of History and Philosophy of Science, University of Cambridge" Department of History and Philosophy of Science READING LISTS HOME SEARCH CONTACT Centres of Excellence: Patronage and the Exact Sciences in the Pre-Modern Middle East, 800 BCE-1500 CE Week 5. Baghdad, 750-950 CE Abbasid Iraq Descendants of Abbas, the prophet's uncle Peace and prosperity Islamic 'commonwealth' Tax-breaks for Muslims Most important caliphs: Mansur, 754-775 CE Ma'mun, son of Harun al-Rashid, 813-833 Population mix: Urban Aramaic-speaking Christians and Jews Urban Persians Christian Arabs in southern towns Nomadic, pagan Arabs Muslim Arabs in Baghdad and Mosul Mansur Mansur's Baghdad Founded on 30 July 762 Date chosen by court astrologer Nawbaht and colleagues Round city: astrological symbolism? Upstream from Ctesiphon, the old Sasanian capital Madinat al-Salam : city of peace Diwan , "bureaux" around central ring Mansur's Sasanian ideology Overthrow of Ummayads plotted in eastern Iran (Khurasan) Persian Barmakid family senior administrators Astrology central to administration 'House of wisdom' simply a Persian style library, one of many diwans

79. Muslims In Science 826 901 ibn qurra, thabit; mathematician. 865- 923 Razi, al- (Rhazes); alchemist,philosopher, physician. 839- 923 Tabari, al-; historian, theologian. http://www.engr.csufresno.edu/~msa/articles/science.html

Muslim Contribution to Science Muslim Contribution to Science Back to Home Islam Audio files Our links ... Email MSA-CSUF Send comments to Webmaster

80. Les Sciences Chez Les Arabes Translate this page Mathématicien, physicien et philosophe arabe, thabit ibn qurra est unbon représentant de la culture arabe du 9e siècle. Descendant http://www.stormloader.com/enit/research/Un peu d'histoire des sciences arabes.h

Les Arabes Algoritmi de numero Indorum . L’expression latine dixit Algorithmus algorithme Sindhind traduction du sanskrit de l’œuvre de Brahma-siddhanta (7e s.) Son livre Kiteb aljabr wal mouqabaka x = a x = ax x + ax = b x = a x + b = ax x = ax + b. x x et a b et c Thabit ibn Qurrah (836, Syrie, 901, Baghdad, Iraq), H H d la fin du livre IX des , Euclide donne une th orie des nombres parfaits et d montre que le nombre n = 2p(2 p+1 -1) est parfait c est- -dire gal la somme de ses diviseurs propres – si (2 p ) est un nombre premier. Th a bit ibn Qurra d cide donc de construire cette th orie. Il nonce et d montre, dans le pur style euclidien, le th or me le plus important jusqu ici pour ces nombres, et qui porte aujourd hui son nom. Notons s n ) la somme des parties aliquotes de l entier n , et s n s n n la somme des diviseurs de n , et rappelons que deux entiers a et b sont dits amiables si s a b et s b a ; le th or me d Ibn Qurra s nonce ainsi: Pour n 1, posons p n n q n 1; si p n-1 p n et q n sont premiers, alors a n p n-1 p n et b n q n sont amiables.

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