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Another Proof of Carlson's Infinite Product Expansion for In(x)

机译:Carlson对In(x)的无限乘积展开的另一种证明

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摘要

The arithmetic—geometric mean inequality is one of the most well-known inequalities of classical analysis. This inequality, in the two variable case, states that for any positive numbers x and y their arithmetic mean A(x, y) = (x y)/2 is always greater than or equal to their geometric mean G(x, y) = xy~(1/2) , that is xy~(1/2) < (x + y)/ 2 , with equality holding if and only if x = y . In contrast, another yet less well-known definition for the mean of two positive numbers x and y is the logarithmic mean defined by L(x, y) = (x — y)/(ln(x) — ln(y)) , for x y, and L(x, x) = x.
机译:算术几何平均不等式是经典分析中最著名的不等式之一。在两个变量的情况下,这种不等式表明,对于任何正数x和y,其算术平均值A(x,y)=(xy)/ 2始终大于或等于其几何平均值G(x,y)= xy〜(1/2),即xy〜(1/2)<(x + y)/ 2,当且仅当x = y时,等式成立。相反,对两个正数x和y的平均值的另一个鲜为人知的定义是由L(x,y)=(x y)/(ln(x)ln(y))定义的对数平均值,对于xy,L(x,x)= x。

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