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算術幾何平均
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Wikipedia definition
1. Arithmetic-geometric mean​In mathematics, the arithmetic-geometric mean (AGM) of two positive real numbers x and y is defined as follows: First compute the arithmetic mean of x and y and call it a1. Next compute the geometric mean of x and y and call it g1; this is the square root of the product xy: . Then iterate this operation with a1 taking the place of x and g1 taking the place of y.
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