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Jyeṣṭhadeva
Jyeṣṭhadeva (Malayalam: ജ്യേഷ്ഠദേവന്) ()〔http://www-history.mcs.st-andrews.ac.uk/Biographies/Jyesthadeva.html〕 was an astronomer-mathematician of the Kerala school of astronomy and mathematics founded by Sangamagrama Madhava (). He is best known as the author of ''Yuktibhāṣā'', a commentary in Malayalam of Tantrasamgraha by Nilakantha Somayaji (1444–1544). In Yuktibhāṣā, Jyeṣṭhadeva had given complete proofs and rationale of the statements in Tantrasamgraha. This was unusual for traditional Indian mathematicians of the time. An analysis of the mathematics content of Yuktibhāṣā has prompted some scholars to call it "the first textbook of calculus". Jyeṣṭhadeva also authored ''Drk-karana'' a treatise on astronomical observations.
==Life period of Jyeṣṭhadeva==
There are a few references to Jyeṣṭhadeva scattered across several old manuscripts.〔 From these manuscripts, one can deduce a few bare facts about the life of Jyeṣṭhadeva. He was a Nambudiri belonging to the Parangngottu family (Sanskrtised as ''Parakroda'') born about the year 1500 CE. He was a pupil of Damodara and a younger contemporary of Nilakantha Somayaji. Achyuta Pisharati was a pupil of Jyeṣṭhadeva. In the concluding verse of his work titled ''Uparagakriyakrama'', completed in 1592, Achyuta Pisharati has referred to Jyeṣṭhadeva as his ''aged benign teacher''. From a few references in ''Drkkarana'', a work believed to be of Jyeṣṭhadeva, one may conclude that Jyeṣṭhadeva lived up to about 1610 CE.
Parangngottu, the family house of Jyeṣṭhadeva, still exists in the vicinity of Trikkandiyur and Alathiyur.〔 There are also several legends connected with members of Parangngottu family.
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「Jyeṣṭhadeva」の詳細全文を読む
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