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Complex AGM
( go to the article → https://www.johndcook.com/blog/2022/07/30/complex-agm/ )
The arithmetic-geometric mean (AGM) of two non-negative real numbers a and b is defined as the limit of the iteration starting with a0 = a and b0 = b and an+1 = ½ (an + bn) bn+1 = √(an bn) for n > 0. This sequence converges very quickly and is useful in numerical algorithms. […] The post Complex AGM first appeared on John D. Cook.
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