Abstract
Using the theory of the cubic modular equation we have discovered a remarkably simple class of cubically convergent algebraic iterations for π.
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References
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Borwein, J.M., Borwein, P.B. An explicit cubic iteration for π. BIT 26, 123–126 (1986). https://doi.org/10.1007/BF01939368
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DOI: https://doi.org/10.1007/BF01939368