<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 was a mathematician from India who worked with British mathematician G.H. Hardy. Ramanujan was an extraordinary mathematician and made many important contributions to mathematics. He is credited with the creation of the infinite series for pi and for the number e.