<human>:  What is the name of the character who is a mathematician in the book ‘The Man Who Knew Infinity’?
<bot>: The character in the book The Man Who Knew Infinity is Ramanujan. He is a famous Indian mathematician who was born in 1887. Ramanujan was a self-taught mathematician who made many significant contributions to mathematics, including the theory of infinite series, number theory, and analytic number theory. He died in 1920 at the age of 32.