Question

Who is Srinivasa Ramanujan,

Why he is so famous in the world of mathematics.

Add some inventions of him did in various branch's of mathematics.

Answer 1

Srinivasa Ramanujan FRS was an Indian mathematician who lived during the British Rule in India. Though he had almost no formal training in pure mathematics, he made substantial contributions to mathematical

Born: 22 December 1887, Erode

He was famous for that he was the man who discovered Infinity.

At age 31 Ramanujan was one of the youngest Fellows in the history of the Royal Society. He was elected "for his investigation in Elliptic functions and the Theory of Numbers." On 13 October 1918

Answer 2

Ramanujan showed that, if you were extremely determined and creative, you could be an Euler-style formalist centuries after everyone thought that that kind of math was completely mined out.

 Most mathematicians attack a problem in such a way that they can see, at least in very rough outlines, from the beginning to the end. 

Ramanujan appears to have simply started at a particular point and expanded outwards, allowing him to get to places that others wouldn't even have thought of trying to go.  This approach had been popular in the 18th century, to the point it appeared to any reasonable person to have been pushed to its limits.  As usual, common sense turned out to be dead wrong.