"The Man Who Knew Infinity" is a 2015 British biographical drama film that tells the true story of the Indian mathematician Srinivasa Ramanujan. The film is based on the 1991 book of the same name by Robert Kanigel

. The story begins in Madras (now Chennai), India, where Ramanujan, a poor and self-taught mathematical genius, struggles with poverty and limited formal education. Despite these challenges, he develops groundbreaking mathematical theories and eventually gains the attention of the renowned Cambridge mathematician G.H. Hardy. Hardy invites Ramanujan to Cambridge University during World War I, where Ramanujan faces cultural and racial prejudices but continues to make significant contributions to mathematics under Hardy's mentorship

. The film stars Dev Patel as Ramanujan and Jeremy Irons as Hardy. It explores Ramanujan's journey from India to England, his personal sacrifices, and his perseverance in the face of adversity, including his battle with tuberculosis. The movie highlights the friendship and collaboration between Ramanujan and Hardy and portrays Ramanujan's profound impact on the field of mathematics

. The film premiered at the 2015 Toronto International Film Festival and was well received for its storytelling, performances, and inspirational message

. In summary, "The Man Who Knew Infinity" (2015) is a biographical film about Srinivasa Ramanujan, focusing on his mathematical genius, his struggles, and his collaboration with G.H. Hardy at Cambridge University during the early 20th century