**Brahmagupta** (Sanskrit: ब्रह्मगुप्त; listen) (598–668 AD) was an Indian mathematician and astronomer who wrote many important works on mathematics and astronomy. His best known work is the *Brāhmasphuṭasiddhānta* (Correctly Established Doctrine of Brahma), written in 628 in Bhinmal. Its 25 chapters contain several unprecedented mathematical results.

Brahmagupta was the first to use zero as a number. He gave rules to compute with zero. Brahmagupta used negative numbers and zero for computing. The modern rule that two negative numbers multiplied together equals a positive number first appears in Brahmasputa siddhanta. It is composed in elliptic verse, as was common practice in Indian mathematics, and consequently has a poetic ring to it. As no proofs are given, it is not known how Brahmagupta's mathematics was derived.

Read more about Brahmagupta: Life and Work, Astronomy