Hindu–Arabic numeral system

The Hindu–Arabic numeral system (also known as the Indo–Arabic numeral system,^[1] Hindu numeral system, Arabic numeral system)^[2]^{[note 1]} is a positional base-ten numeral system for representing integers; its extension to non-integers is the decimal numeral system, which is presently the most common numeral system.

Modern-day Arab telephone keypad with two forms of Arabic numerals: Western Arabic numerals on the left and Eastern Arabic numerals on the right

The system was invented between the 1st and 4th centuries by Indian mathematicians. By the 9th century, the system was adopted by Arabic mathematicians who extended it to include fractions. It became more widely known through the writings in Arabic of the Persian mathematician Al-Khwārizmī^[3] (On the Calculation with Hindu Numerals, c. 825) and Arab mathematician Al-Kindi (On the Use of the Hindu Numerals, c. 830). The system had spread to medieval Europe by the High Middle Ages, notably following Fibonacci's 13th century Liber Abaci; until the evolution of the printing press in the 15th century, use of the system in Europe was mainly confined to Northern Italy.^[4]

It is based upon ten glyphs representing the numbers from zero to nine, and allows representing any natural number by a unique sequence of these glyphs. The symbols (glyphs) used to represent the system are in principle independent of the system itself. The glyphs in actual use are descended from Brahmi numerals and have split into various typographical variants since the Middle Ages.

These symbol sets can be divided into three main families: Western Arabic numerals used in the Greater Maghreb and in Europe; Eastern Arabic numerals used in the Middle East; and the Indian numerals in various scripts used in the Indian subcontinent.

Origins

Sometime around 600 CE, a change began in the writing of dates in the Brāhmī-derived scripts of India and Southeast Asia, transforming from an additive system with separate numerals for numbers of different magnitudes to a positional place-value system with a single set of glyphs for 1–9 and a dot for zero, gradually displacing additive expressions of numerals over the following several centuries.^[5]

When this system was adopted and extended by medieval Arabs and Persians, they called it al-ḥisāb al-hindī ("Indian arithmetic"). These numerals were gradually adopted in Europe starting around the 10th century, probably transmitted by Arab merchants;^[6] medieval and Renaissance European mathematicians generally recognized them as Indian in origin,^[7] however a few influential sources credited them to the Arabs, and they eventually came to be generally known as "Arabic numerals" in Europe.^[8] According to some sources, this number system may have originated in Chinese Shang numerals (1200 BCE), which was also a decimal positional numeral system.^[9]

Positional notation

The Hindu–Arabic system is designed for positional notation in a decimal system. In a more developed form, positional notation also uses a decimal marker (at first a mark over the ones digit but now more commonly a decimal point or a decimal comma which separates the ones place from the tenths place), and also a symbol for "these digits recur ad infinitum". In modern usage, this latter symbol is usually a vinculum (a horizontal line placed over the repeating digits). In this more developed form, the numeral system can symbolize any rational number using only 13 symbols (the ten digits, decimal marker, vinculum, and a prepended minus sign to indicate a negative number).

Although generally found in text written with the Arabic abjad ("alphabet"), which is written right-to-left, numbers written with these numerals place the most-significant digit to the left, so they read from left to right (though digits are not always said in order from most to least significant^[10]). The requisite changes in reading direction are found in text that mixes left-to-right writing systems with right-to-left systems.

Symbols

Various symbol sets are used to represent numbers in the Hindu–Arabic numeral system, most of which developed from the Brahmi numerals.

The symbols used to represent the system have split into various typographical variants since the Middle Ages, arranged in three main groups:

The widespread Western "Arabic numerals" used with the Latin, Cyrillic, and Greek alphabets in the table, descended from the "West Arabic numerals" which were developed in al-Andalus and the Maghreb (there are two typographic styles for rendering western Arabic numerals, known as lining figures and text figures).
The "Arabic–Indic" or "Eastern Arabic numerals" used with Arabic script, developed primarily in what is now Iraq.^{[citation needed]} A variant of the Eastern Arabic numerals is used in Persian and Urdu.
The Indian numerals in use with scripts of the Brahmic family in India and Southeast Asia. Each of the roughly dozen major scripts of India has its own numeral glyphs (as one will note when perusing Unicode character charts).

Glyph comparison

Symbol										Used with scripts	Numerals
0	1	2	3	4	5	6	7	8	9	Arabic, Latin, Cyrillic, and Greek	Arabic numerals
٠	١	٢	٣	٤	٥	٦	٧	٨	٩	Arabic	Eastern Arabic numerals
۰	۱	۲	۳	۴	۵	۶	۷	۸	۹	Persian / Dari / Pashto
۰	۱	۲	۳	۴	۵	۶	۷	۸	۹	Urdu / Shahmukhi
⠚	⠁	⠃	⠉	⠙	⠑	⠋	⠛	⠓	⠊	Braille	Braille numerals
〇	一	二	三	四	五	六	七	八	九	Chinese / Japanese	Chinese and Japanese numerals
영	일	이	삼	사	오	육	칠	팔	구	Korean	Korean numerals (Sino cardinals)^{[note 2]}
𑁦	𑁧	𑁨	𑁩	𑁪	𑁫	𑁬	𑁭	𑁮	𑁯	Brahmi	Brahmi numerals
०	१	२	३	४	५	६	७	८	९	Devanagari	Devanagari numerals
௦	௧	௨	௩	௪	௫	௬	௭	௮	௯	Tamil	Tamil numerals
০	১	২	৩	৪	৫	৬	৭	৮	৯	Eastern Nagari	Bengali numerals
𐴰	𐴱	𐴲	𐴳	𐴴	𐴵	𐴶	𐴷	𐴸	𐴹	Hanifi Rohingya	Hanifi Rohingya script § Numbers
੦	੧	੨	੩	੪	੫	੬	੭	੮	੯	Gurmukhi	Gurmukhi numerals
૦	૧	૨	૩	૪	૫	૬	૭	૮	૯	Gujarati	Gujarati numerals
𑙐	𑙑	𑙒	𑙓	𑙔	𑙕	𑙖	𑙗	𑙘	𑙙	Modi	Modi numerals
𑋰	𑋱	𑋲	𑋳	𑋴	𑋵	𑋶	𑋷	𑋸	𑋹	Khudabadi	Khudabadi script § Numerals
୦	୧	୨	୩	୪	୫	୬	୭	୮	୯	Odia	Odia numerals
᱐	᱑	᱒	᱓	᱔	᱕	᱖	᱗	᱘	᱙	Santali	Santali numerals
𑇐	𑇑	𑇒	𑇓	𑇔	𑇕	𑇖	𑇗	𑇘	𑇙	Sharada	Sharada numerals
౦	౧	౨	౩	౪	౫	౬	౭	౮	౯	Telugu	Telugu script § Numerals
೦	೧	೨	೩	೪	೫	೬	೭	೮	೯	Kannada	Kannada script § Numerals
൦	൧	൨	൩	൪	൫	൬	൭	൮	൯	Malayalam	Malayalam numerals
꯰	꯱	꯲	꯳	꯴	꯵	꯶	꯷	꯸	꯹	Meitei	Meitei script § Numerals
෦	෧	෨	෩	෪	෫	෬	෭	෮	෯	Sinhala	Sinhala numerals
𑓐	𑓑	𑓒	𑓓	𑓔	𑓕	𑓖	𑓗	𑓘	𑓙	Tirhuta Mithilakshar	Maithili numerals
༠	༡	༢	༣	༤	༥	༦	༧	༨	༩	Tibetan	Tibetan numerals
᠐	᠑	᠒	᠓	᠔	᠕	᠖	᠗	᠘	᠙	Mongolian	Mongolian numerals
᥆	᥇	᥈	᥉	᥊	᥋	᥌	᥍	᥎	᥏	Limbu	Limbu script § Digits
၀	၁	၂	၃	၄	၅	၆	၇	၈	၉	Burmese	Burmese numerals
႐	႑	႒	႓	႔	႕	႖	႗	႘	႙	Shan	Shan alphabet § Numerals
០	១	២	៣	៤	៥	៦	៧	៨	៩	Khmer	Khmer numerals
๐	๑	๒	๓	๔	๕	๖	๗	๘	๙	Thai	Thai numerals
໐	໑	໒	໓	໔	໕	໖	໗	໘	໙	Lao	Lao script § Numerals
᧐	᧑/᧚	᧒	᧓	᧔	᧕	᧖	᧗	᧘	᧙	New Tai Lue	New Tai Lue script § Digits
꩐	꩑	꩒	꩓	꩔	꩕	꩖	꩗	꩘	꩙	Cham	Cham script § Numerals
𑽐	𑽑	𑽒	𑽓	𑽔	𑽕	𑽖	𑽗	𑽘	𑽙	Kawi	Kawi script § Digits
꧐	꧑	꧒	꧓	꧔	꧕	꧖	꧗	꧘	꧙	Javanese	Javanese numerals
᭐	᭑	᭒	᭓	᭔	᭕	᭖	᭗	᭘	᭙	Balinese	Balinese numerals
᮰	᮱	᮲	᮳	᮴	᮵	᮶	᮷	᮸	᮹	Sundanese	Sundanese numerals

History

Predecessors

The first Brahmi numerals, ancestors of Hindu-Arabic numerals, used by Ashoka in his Edicts of Ashoka c. 250 BC

The Brahmi numerals at the basis of the system predate the Common Era. They replaced the earlier Kharosthi numerals used since the 4th century BCE. Brahmi and Kharosthi numerals were used alongside one another in the Maurya Empire period, both appearing on the 3rd century BCE edicts of Ashoka.^[11]

Nagari and Devanagari numerals with handwritten variants

Buddhist inscriptions from around 300 BCE use the symbols that became 1, 4, and 6. One century later, their use of the symbols that became 2, 4, 6, 7, and 9 was recorded. These Brahmi numerals are the ancestors of the Hindu–Arabic glyphs 1 to 9, but they were not used as a positional system with a zero, and there were rather^{[clarification needed]} separate numerals for each of the tens (10, 20, 30, etc.).

The actual numeral system, including positional notation and use of zero, is in principle independent of the glyphs used, and significantly younger than the Brahmi numerals.

Development

The place-value system is used in the Bakhshali manuscript, the earliest leaves being radiocarbon dated to the period 224–383 CE.^[12] The development of the positional decimal system takes its origins in^{[clarification needed]} Indian mathematics during the Gupta period. Around 500, the astronomer Aryabhata uses the word kha ("emptiness") to mark "zero" in tabular arrangements of digits. The 7th century Brahmasphuta Siddhanta contains a comparatively advanced understanding of the mathematical role of zero. The Sanskrit translation of the lost 5th century Prakrit Jaina cosmological text Lokavibhaga may preserve an early instance of the positional use of zero.^[13]

The first dated and undisputed inscription showing the use of a symbol for zero appears on a stone inscription found at the Chaturbhuja Temple at Gwalior in India, dated 876 CE.^[14]

Medieval Islamic world

These Indian developments were taken up in Islamic mathematics in the 8th century, as recorded in al-Qifti's Chronology of the scholars (early 13th century).^[15]

In 10th century Islamic mathematics, the system was extended to include fractions, as recorded in a treatise by Abbasid Caliphate mathematician Abu'l-Hasan al-Uqlidisi, who was the first to describe positional decimal fractions.^[16] According to J. L. Berggren, the Muslims were the first to represent numbers as we do since they were the ones who initially extended this system of numeration to represent parts of the unit by decimal fractions, something that the Hindus did not accomplish. Thus, we refer to the system as "Hindu–Arabic" rather appropriately.^[17]^[18]

The numeral system came to be known to both the Persian mathematician Khwarizmi, who wrote a book, On the Calculation with Hindu Numerals in about 825 CE, and the Arab mathematician Al-Kindi, who wrote a book, On the Use of the Hindu Numerals (كتاب في استعمال العداد الهندي [kitāb fī isti'māl al-'adād al-hindī]) around 830 CE. Persian scientist Kushyar Gilani who wrote Kitab fi usul hisab al-hind (Principles of Hindu Reckoning) is one of the oldest surviving manuscripts using the Hindu numerals.^[19] These books are principally responsible for the diffusion of the Hindu system of numeration throughout the Islamic world and ultimately also to Europe.

Adoption in Europe

The Arabic numeral system first appeared in Europe in the Spanish Codex Vigilanus, year 976.

In Christian Europe, the first mention and representation of Hindu–Arabic numerals (from one to nine, without zero), is in the Codex Vigilanus (aka Albeldensis), an illuminated compilation of various historical documents from the Visigothic period in Spain, written in the year 976 CE by three monks of the Riojan monastery of San Martín de Albelda. Between 967 and 969 CE, Gerbert of Aurillac discovered and studied Arab science in the Catalan abbeys. Later he obtained from these places the book De multiplicatione et divisione (On multiplication and division). After becoming Pope Sylvester II in the year 999 CE, he introduced a new model of abacus, the so-called Abacus of Gerbert, by adopting tokens representing Hindu–Arabic numerals, from one to nine.

Leonardo Fibonacci brought this system to Europe. His book Liber Abaci introduced Modus Indorum (the method of the Indians), today known as Hindu–Arabic numeral system or base-10 positional notation, the use of zero, and the decimal place system to the Latin world. The numeral system came to be called "Arabic" by the Europeans. It was used in European mathematics from the 12th century, and entered common use from the 15th century to replace Roman numerals.^[20]^[21]

The familiar shape of the Western Arabic glyphs as now used with the Latin alphabet (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) are the product of the late 15th to early 16th century, when they entered early typesetting. Muslim scientists used the Babylonian numeral system, and merchants used the Abjad numerals, a system similar to the Greek numeral system and the Hebrew numeral system. Similarly, Fibonacci's introduction of the system to Europe was restricted to learned circles. The credit for first establishing widespread understanding and usage of the decimal positional notation among the general population goes to Adam Ries, an author of the German Renaissance, whose 1522 Rechenung auff der linihen und federn (Calculating on the Lines and with a Quill) was _targeted at the apprentices of businessmen and craftsmen.

Gregor Reisch, Madame Arithmatica, 1508
A calculation table [de], used for arithmetic using Roman numerals
Adam Ries, Rechenung auff der linihen und federn, 1522
Two arithmetic books published in 1514 – Köbel (left) using a calculation table and Böschenteyn using numerals
Adam Ries, Rechenung auff der linihen und federn (2nd Ed.), 1525
Robert Recorde, The ground of artes, 1543
Peter Apian, Kaufmanns Rechnung, 1527
Adam Ries, Rechenung auff der linihen und federn (2nd Ed.), 1525

Adoption in East Asia

In 690 CE, Empress Wu promulgated Zetian characters, one of which was "〇". The word is now used as a synonym for the number zero.

In China, Gautama Siddha introduced Hindu numerals with zero in 718 CE, but Chinese mathematicians did not find them useful, as they had already had the decimal positional counting rods.^[22]^[23]

In Chinese numerals, a circle (〇) is used to write zero in Suzhou numerals. Many historians think it was imported from Indian numerals by Gautama Siddha in 718 CE, but some Chinese scholars think it was created from the Chinese text space filler "□".^[22]

Chinese and Japanese finally adopted the Hindu–Arabic numerals in the 19th century, abandoning counting rods.

Spread of the Western Arabic variant

The "Western Arabic" numerals as they were in common use in Europe since the Baroque period have secondarily found worldwide use together with the Latin alphabet, and even significantly beyond the contemporary spread of the Latin alphabet, intruding into the writing systems in regions where other variants of the Hindu–Arabic numerals had been in use, but also in conjunction with Chinese and Japanese writing (see Chinese numerals, Japanese numerals).

Notes

^ Hindu was the Persian name for "Indian" in the 10th century, when the Arabs adopted the number system. The use of "Hindu" to refer to a religion was a later development.
^ 6 is 륙 in North Korea.

References

^ Audun Holme, Geometry: Our Cultural Heritage, 2000
^ William Darrach Halsey, Emanuel Friedman (1983). Collier's Encyclopedia, with bibliography and index. When the Arabian empire was expanding and contact was made with India, the Hindu numeral system and the early algorithms were adopted by the Arabs
^ Brezina, Corona (2006), Al-Khwarizmi: The Inventor of Algebra, The Rosen Publishing Group, pp. 39–40, ISBN 978-1-4042-0513-0
^ Danna, Raffaele (13 Jan 2021). "Figuring Out: The Spread of Hindu-Arabic Numerals in the European Tradition of Practical Mathematics (13th–16th Centuries)". Nuncius. 36 (1): 5–48. doi:10.1163/18253911-bja10004. ISSN 0394-7394.
^ Chrisomalis 2010, pp. 194–197.
^ Smith & Karpinski 1911, Ch. 7, pp. 99–127.
^ Smith & Karpinski 1911, p. 2.
^ Of particular note is Johannes de Sacrobosco's 13th century Algorismus, which was extremely popular and influential. See Smith & Karpinski 1911, pp. 134–135.
^ Swetz, Frank (1984). "The Evolution of Mathematics in Ancient China". In Campbell, Douglas M.; Higgins, John C. (eds.). Mathematics: People, Problems, Results. Taylor & Francis. ISBN 978-0-534-02879-4.
Lam, Lay Yong (1988). "A Chinese Genesis: Rewriting the History of Our Numeral System". Archive for History of Exact Sciences. 38 (2): 101–108. doi:10.1007/BF00348453. JSTOR 41133830.
Lam, Lay Yong (2008). "Computation: Chinese Counting Rods". In Selin, Selaine (ed.). Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures. Springer. ISBN 978-1-4020-4559-2.
^ In German, a number like 21 is said like "one and twenty", as though being read from right to left. In Biblical Hebrew, this is sometimes done even with larger numbers, as in Esther 1:1, which literally says, "Ahasuerus which reigned from India even unto Ethiopia, over seven and twenty and a hundred provinces".
^ Flegg 1984, p. 67ff..
^ Pearce, Ian (May 2002). "The Bakhshali manuscript". The MacTutor History of Mathematics archive. Retrieved 2007-07-24.
^ Ifrah, G. The Universal History of Numbers: From prehistory to the invention of the computer. John Wiley and Sons Inc., 2000. Translated from the French by David Bellos, E.F. Harding, Sophie Wood and Ian Monk
^ Bill Casselman (Feb 2007). "All for Nought". Feature Column. AMS.
^ al-Qifti's Chronology of the scholars (early 13th century):
... a person from India presented himself before the Caliph al-Mansur in the year 776 who was well versed in the siddhanta method of calculation related to the movement of the heavenly bodies, and having ways of calculating equations based on the half-chord [essentially the sine] calculated in half-degrees ... Al-Mansur ordered this book to be translated into Arabic, and a work to be written, based on the translation, to give the Arabs a solid base for calculating the movements of the planets ...
^ Berggren, J. Lennart (2007). "Mathematics in Medieval Islam". In Katz, Victor J. (ed.). The Mathematics of Egypt, Mesopotamia, China, India, and Islam: A Sourcebook. Princeton University Press. p. 530. ISBN 978-0-691-11485-9.
^ Berggren, J. L. (18 Jan 2017). Episodes in the Mathematics of Medieval Islam. Springer. ISBN 978-1-4939-3780-6.
^ Berggren, J. Lennart (2007). "Mathematics in Medieval Islam". The Mathematics of Egypt, Mesopotamia, China, India, and Islam: A Sourcebook. Princeton University Press. p. 518. ISBN 978-0-691-11485-9.
^ Ibn Labbān, Kūshyār (1965). Kitab fi usul hisab al-hind [Principles of Hindu Reckoning]. Translated by Levey, Martin; Petruck, Marvin. Madison: University of Wisconsin Press. p. 3. ISBN 978-0-299-03610-2. LCCN 65012106. OL 5941486M.
^ "Fibonacci Numbers". www.halexandria.org.
^ HLeonardo Pisano: "Contributions to number theory". Encyclopædia Britannica Online, 2006. p. 3. Retrieved 18 September 2006.
^ ^a ^b Qian, Baocong (1964), Zhongguo Shuxue Shi (The history of Chinese mathematics), Beijing: Kexue Chubanshe
^ Wáng, Qīngxiáng (1999), Sangi o koeta otoko (The man who exceeded counting rods), Tokyo: Tōyō Shoten, ISBN 4-88595-226-3

Bibliography

Chrisomalis, Stephen (2010). Numerical Notation: A Comparative History. Cambridge University Press. ISBN 978-0-521-87818-0.
Flegg, Graham (1984). Numbers: Their History and Meaning. Penguin. ISBN 978-0-14-022564-8.
O'Connor, John J.; Robertson, Edmund F. (2001). "The Arabic numeral system". MacTutor History of Mathematics Archive. University of St Andrews.
O'Connor, John J.; Robertson, Edmund F. (2000). "Indian numerals". MacTutor History of Mathematics Archive. University of St Andrews.
Smith, David Eugene; Karpinski, Louis Charles (1911). The Hindu–Arabic Numerals. Boston: Ginn.