Srinivasa Iyengar Ramanujan

Srinivas Ramanujan was born on December 22, 1887 in his grandmother's house in Erode, Tamil Nadu.

In January 1913 Ramanujan wrote to G. H. Hardy having seen a copy of his 1910 book Orders of Infinity. In Ramanujan's historic first letter to Hardy, he introduced himself and his work of about 100 theorems. In 1914, Hardy brought Ramanujan to Trinity College, Cambridge, to begin an extraordinary collaboration between two mathematicians.

On 16 March, 1916 Ramanujan graduated from Cambridge with a Bachelor of Science by Research (the degree was called a Ph.D. from 1920).

Ramanujan's dissertation was on Highly Composite Numbers and consisted of seven of his papers published in England. Ramanujan would go on to publish 26 papers in British journals. On May 2, 1918, Srinivasa Iyengar Ramanujan was elected Fellow of the Royal Society of London. He would be the first Indian and first Asian to be elected so.

Srinivasa Ramanujan was one of India's greatest mathematical geniuses. He made substantial contributions to the analytical theory of numbers and worked on elliptic functions, continued fractions, and infinite series. Ramanujan's work on partial sums and products of hypergeometric series led to major development in the topic.

He gave his name to two constants, the Landau-Ramanujan constant and the Nielsen-Ramanujan constant.

Ramanujan died on April 26, 1920 at the age of 33 in Kumbakonam, Tamil Nadu. Before he died, Ramanujan wrote down about 600 theorems on loose sheets of paper, which were discovered and published only in 1976 as the "Lost Notebook" of Ramanujan.