Brahmagupta wrote his Brāhmasphutasiddhānta in 628 CE, in Sanskrit. It contains ideas including a good understanding of the mathematical role of zero, rules for manipulating both negative and positive numbers. It also contains a method for computing square roots, methods of solving linear and some quadratic equations, and rules for summing series, Brahmagupta’s identity, and the Brahmagupta’s theorem. The book was written completely in verse. I have produced a PDF of Brahmagupta’s Brāhmasphuṭasiddhānta
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