History of the Hindu-Arabic numeral system

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The Hindu-Arabic numeral system originates from the Hindu numeral system, which is a pure place value system, that requires a zero.[1] Though it is, in actuality, a purely Hindu numeral system, it is known to the Western world as Hindu-Arabic because of its introduction to Europe through the Islamic middle east.

Contents

[edit] Origins

In Sanskrit literature number words for 1-9, 10, 100 and further powers of 10 - up to 10 - were used (similar to decimal system).[2]. The most widely used place value symbols belong to the Nagari script numerals, very similar to the Brahmi numerals, which form the basis of the modern Arabic numerals. [3]

Historians trace many modern numerals to the Brahmi numerals, which were in use around the middle of the third century BC.[4] The place value system, however, evolved later. The Brahmi numerals have been found in inscriptions in caves and on coins in regions near Pune, Mumbai, and Uttar Pradesh. Dating these numerals tells us that they were in use over quite a long time span up to the 4th century AD.[5]

During the Gupta period (early 4th century AD to the late 6th century AD), the Gupta numerals developed from the Brahmi numerals and were spread over large areas by the Gupta empire as they conquered territory. [6] Beginning around 7th century, the Gupta numerals evolved into the Nagari numerals.

[edit] Positional notation

There is evidence that the Babylonians had a place value system as early as the 19th century BC. However, the Babylonian systems were to base 60. Babylonians used a separator mark to separate various place values. This separator mark never was used at the end of a number, and it was not possible to tell the difference between 2 and 20. This innovation was brought about by Brahmagupta of India. Further, the Babylonian place value marker did not stand alone, as per the Indian "0". There is unsure evidence that the Indians developed a positional number system as early as the first century CE [7]. However, the oldest dated Indian document showing use of the modern place value form is a legal document dated 346 in the Chedii calendar, which translates to 594 CE. [8], but some historians claim that the date has been added as a later forgery. Despite such doubts, historians are fairly certain that an early place-value system was in use in India by the end of the 5th century. [9] Indian books dated to this period are able to denote numbers in the hundred thousands using a place value system. [10] Many other inscriptions have been found which are dated and make use of the place-value system for either the date or some other numbers within the text [11], although some historians claim these to also be forgeries.[12] In around 500 CE Aryabhata devised a positional number system without a zero digit. He used the word "kha" for the zero position.[13] Evidence suggests that a dot had been used in earlier Indian manuscripts to denote an empty place in positional notation. [14]. The same documents sometimes also used a dot to denote an unknown where we might use x. Later Indian mathematicians had names for zero in positional numbers yet had no symbol for it.

The use of zero in these positional systems are the final step to the system of numerals we are familiar with today. The first inscription showing the use of zero which is dated and is not disputed by any historian is the inscription at Gwalior dated 933 in the Vikrama calendar (876 CE.) [15] [16].

The oldest known text to use zero is the Jain text from India entitled the Lokavibhaaga , dated 458 AD. [1]

The first indubitable appearance of a symbol for zero appears in 876 in India on a stone tablet in Gwalior. Documents on copper plates, with the same small o in them, dated back as far as the sixth century AD, abound.[2]

[edit] Adoption by the Arabs

Before the rise of the Arab empire, the Hindu-Arabic numeral system was already moving West and was mentioned in Syria in 662 AD by the Nestorian scholar Severus Sebokht who wrote the following:

"I will omit all discussion of the science of the Indians, ... , of their subtle discoveries in astronomy, discoveries that are more ingenious than those of the Greeks and the Babylonians, and of their valuable methods of calculation which surpass description. I wish only to say that this computation is done by means of nine signs. If those who believe, because they speak Greek, that they have arrived at the limits of science, would read the Indian texts, they would be convinced, even if a little late in the day, that there are others who know something of value."[17]

According to al-Qifti's chronology of the scholars[18]:

"... a person from India presented himself before the Caliph al-Mansur in the year [776 AD] 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 ... Thiinto 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 ..."

The work was most likely to have been Brahmagupta's Brahmasphutasiddhanta (Ifrah) [19] (The Opening of the Universe) which was written in 628[20]. Irrespective of whether Ifrah is right, since all Indian texts after Aryabhata's Aryabhatiya used the Indian number system, certainly from this time the Arabs had a translation of a text written in the Indian number system. [21]

In his text The Arithmetic of Al-Uqlîdisî (Dordrecht: D. Reidel, 1978), A.S. Saidan's studies were unable to answer in full how the numerals reached the Arab world:

"It seems plausible that it drifted gradually, probably before the seventh century, through two channels, one starting from Sind, undergoing Persian filtration and spreading in what is now known as the Middle East, and the other starting from the coasts of the Indian Ocean and extending to the southern coasts of the Mediterranean."[22]

Al-Uqlidisi developed a notation to represent decimal fractions. [23][24] Despite many scholars finding calculating with Indian symbols helpful in their work, the common Arabs, including the business community continued to use their finger arithmetic throughout the tenth century. [25]. The numerals came to fame due to their use in the pivotal work of the Persian mathematician Al-Khwarizmi, whose book On the Calculation with Hindu Numerals was written about 825, and the Arab mathematician Al-Kindi, who wrote four volumes (see [2]) "On the Use of the Indian Numerals" (Ketab fi Isti'mal al-'Adad al-Hindi) about 830. They, amongst other works, contributed to the diffusion of the Indian system of numeration in the Middle-East and the West.

[edit] Adoption in Europe

Main article: Arabic numerals

Fibonacci, an Italian mathematician who had studied in Bejaia (Bougie), Algeria, promoted the Arabic numeral system in Europe with his book Liber Abaci, which was published in 1202. The system did not come into wide use in Europe, however, until the invention of printing (See, for example, the 1482 Ptolemaeus map of the world printed by Lienhart Holle in Ulm, and other examples in the Gutenberg Museum in Mainz, Germany.)

In the last few centuries, the European variety of Arabic numbers was spread around the world and gradually became the most commonly used numeral system in the world. Even in many countries in languages which have their own numeral systems, the European Arabic numerals are widely used in commerce and mathematics.

[edit] Impact on Mathematics

The significance of the development of the positional number system is probably best described by the French mathematician Pierre Simon Laplace (1749 - 1827) who wrote:

"It is India that gave us the ingenuous method of expressing all numbers by the means of ten symbols, each symbol receiving a value of position, as well as an absolute value; a profound and important idea which appears so simple to us now that we ignore its true merit, but its very simplicity, the great ease which it has lent to all computations, puts our arithmetic in the first rank of useful inventions, and we shall appreciate the grandeur of this achievement when we remember that it escaped the genius of Archimedes and Apollonius, two of the greatest minds produced by antiquity."

Tobias Dantzig, the father of George Dantzig had this to say in Number:

"This long period of nearly five thousand years saw the rise and fall of many a civilization, each leaving behind it a heritage of literature, art, philosophy, and religion. But what was the net achievement in the field of reckoning, the earliest art practiced by man? An inflexible numeration so crude as to make progress well nigh impossible, and a calculating device so limited in scope that even elementary calculations called for the services of an expert [...] Man used these devices for thousands of years without contributing a single important idea to the system [...] Even when compared with the slow growth of ideas during the dark ages, the history of reckoning presents a peculiar picture of desolate stagnation. When viewed in this light, the achievements of the unknown Hindu, who some time in the first centuries of our era discovered the principle of position, assumes the importance of a world event."

[edit] References

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