Hindu roots of modern mathematics

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As to when the Hindus first began writing whole numbers according to this system, the available evidence shows that the system was not used by the great Indian astronomer Aryabhata (born in A.D. 476), but it was in use by the time of his pupil, Bhaskara I, around the year A.D. 520. (See Van der Waerden and Folkerts for more details.) News of the discovery spread, for, about 150 years later, Severus Sebokht, a bishop of the Nestorian Church ( one of the several Christian faiths existing in the East at the time), wrote from his residence in Keneshra on the upper Euphrates river as follows: I will not say anything now of the science of the Hindus, who are not even Syrians, of their subtle discoveries in this science of astronomy, which are even more ingenious then those of the Greeks and Babylonians, and of the fluent method of their calculation, which surpasses words. I want to say only that it is done with nine signs. If those who believe that they have arrived at the limit of science because they speak Greek ad known these things they would perhaps be convinced, even if a bit late, that there are others who know something, not only Greeks but also men of a different language. Hindu system of numeration had spread so far by the year A.D. 662, it may be surprising to learn that the earliest Arabic work we know of explaining the Hindu system is one written early in the ninth century whose title may be translated as The Book of Addition and Subtraction According to the Hindu Calculation. The author was Muhammad ibn Musa al-Khwarizmi who, since the was born around the year A.D. 780, probably wrote his book after A.D. 800. The question arises, however, where al-Khwarizmi learned of the Hindu arithmetic, given that his home was in a region far from where Bishop Sebokht learned of Hindu numerals 150 years earlier. for info http://www.iviews.com/Articles/articles.asp?ref=IC0612-3192