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The film stars Dev Patel as Srinivasa Ramanujan, a real-life mathematician who, after growing up poor in Madras, India, earns admittance to Cambridge University during World War I, where he becomes a pioneer in mathematical theories with the guidance of his professor, G. H. Hardy, portrayed by Jeremy Irons.

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After the film's world premiere, Allan Hunter in Screen Daily found the film to be "a well-heeled, sincere production following the memories of Ramanujan's English mentor and friend ... The film tells such a good story that it is hard to resist. The old-fashioned virtues of a well-told tale and a particularly fine performance from Jeremy Irons should endear the film to that supposedly under-served older demographic who like to turn out for a weekday matinee ... Mathematics plays a key role in the story, but in a way that is entirely accessible, allowing the viewer to comprehend the advances that Ramanujan made and why his legacy remains so important almost a century after his death."

https://en.wikipedia.org/wiki/The_Man_Who_Knew_Infinity