Bryan John Birch
Bryan John Birch FRS (born 25 September 1931) is a British mathematician.More influenced by Harold Davenport, he proved Birch's theorem, one of the results to come out of the Hardy–Littlewood circle method.He then worked with Peter Swinnerton-Dyer on computations relating to the Hasse–Weil L-functions of elliptic curves.Their subsequently formulated conjecture relating the rank of an elliptic curve to the order of zero of an L-function has been an influence on the development of number theory from the mid-1960s onwards.Birch put together the context in which the Gross–Zagier theorem was proved; the correspondence is now published.