Brahmagupta

Brahmagupta ( ब्रह्मगुप्त ) (Multân, 598 - 668) Indian Mathématicien is a .

Brahmagupta is one of the most important mathematicians both of India and of its time. Two major works are known to him: the Brâhma Siddhânta ( ब्रह्मसिद्धान्त ) (628) and the Khandakhâdyaka (665).

It directs the astronomical observatory of Ujjain, city which is at the 7th century research a major center in mathematics. It is in its first works the Brahmasphutasiddhanta , which it defines the Zero like result of the subtraction of a number by itself, which it describes the results of operations with this new number, but is mistaken while giving like result zero to 0/0, on the other hand it gives correct rules on the relative signs at the time of operations between whole (profits and losses). It also gives in this work the solution of the general equation of degree 2.

Brahmagupta was the first mathematician to use the algebra to solve astronomical problems. He proposed like duration of the year: 365 days, 6 hours, 5 minutes, and 19 seconds, during a first estimate. In its second delivers the Khandakhâdyaka , it proposes 365 days, 6 hours, 12 minutes and 36 seconds. The true length of the years is of a little less than 365 days and 6 hours.

See too

• Identity of Brahmagupta
• Formule_Brahmagupta