<human>:  In the book, ‘The Man Who Knew Infinity’, what is the name of the character who is the main protagonist?
<bot>: The main protagonist is the mathematician Srinivasa Ramanujan. He was born in India in 1887, and died in 1920 at the age of 32. He made many significant contributions to mathematics, including the theory of infinite series and the creation of a new branch of mathematics called analytic number theory. He was also a prolific writer and published over 400 papers.