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Brahmagupta ((サンスクリット:ब्रह्मगुप्त); ) (born c. 598, died after 665) was an Indian mathematician and astronomer. He is the author of two early works on mathematics and astronomy: the ''Brāhmasphuṭasiddhānta'' (BSS, "correctly established doctrine of Brahma", dated 628), a theoretical treatise, and the ''Khaṇḍakhādyaka'' ("edible bite", dated 665), a more practical text. According to his commentators, Brahmagupta was a native of Bhinmal. Brahmagupta was the first to give rules to compute with ''zero''. The texts composed by Brahmagupta were composed in elliptic verse in Sanskrit, as was common practice in Indian mathematics. As no proofs are given, it is not known how Brahmagupta's results were derived.〔(Brahmagupta biography )〕 ==Author== The text of the ''Brāhmasphuṭasiddhānta'' (24.7–8) states that Brahmagupta composed the work at the age of 30 in Saka era 550 (i.e. CE 628), during the reign of King Vyāghramukha, establishing CE 598 as Brahmagupta's year of birth.〔, 〕 He is said to have been a native of Bhillamala, a city in the state of Rajasthan, at the time the seat of power of the Gurjars. His father's name is recorded as Jisnugupta. He likely lived most of his life in Bhillamala during the reign (and possibly under the patronage) of King Vyaghramukha.〔(Plofker 2007, pp. 421–427)〕 For this reason, Brahmagupta is also referred to as Bhillamalacharya, that is, the teacher from Bhillamala. He was the head of the astronomical observatory at Ujjain, and it was during his tenure there that he wrote his two surviving treatises, both on mathematics and astronomy: the ''Brahmasphutasiddhanta'' in 628, and the ''Khandakhadyaka'' in 665. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Brahmagupta」の詳細全文を読む スポンサード リンク
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