Aryabhata was an Indian mathematician and astronomer from the classical age of India who lived from 476 to 550 CE. He made several important contributions to mathematics including the solution of quadratic equations and calculating pi to 4 decimal places. Bhaskaracharya was an Indian mathematician who lived from 1114 to 1185 CE. He was the first to state that division by zero results in infinity and wrote extensively on topics including zero, surds, and trigonometry. Brahmagupta was an Indian mathematician from the 7th century who made contributions to astronomy and mathematics including early work on zero and the modern number system.