"There is a close and beautiful connection between the transformation theory for elliptic integrals and the very rapid approximation of pi. This connection was first made explicit by Ramanujan in his 1914 paper " Modular Equations and Approximations to π " ...."
— Π

January 1, 1970

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Original Language: English

Sources

Jonathan M. Borwein, Peter B. Borwein, and David H. Bailey, "Ramanujan, modular equations, and approximations to pi or how to compute one billion digits of pi." The American Mathematical Monthly 96, no. 3 (1989): 201–219.