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arXiv 0912.2182math.CAmath.KT
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Gautchi比与R^n中单位球的体积

Gautchi's ratio and the Volume of the unit ball in R^n

D. Karayannakis

摘要:

设Ω(n)为R^n中单位球的体积。我们将Γ函数比伽玛(x+1/2)/伽玛(x)(x>0)表示为一个无穷乘积,这使我们能够再现和/或产生各种公式和不等式,其中一些似乎是新的,涉及Omega(n-1)/Omega(n)和(Omega(n))^2/Omega(n-1)Omega(n+1)

英文摘要:

Let Omega(n) be the volume of the unit ball in R^n. We formulate as an infinite product the gamma function ratio gamma(x+1/2)/gamma(x),x>0, which allows us to reproduce and /or produce a variety of formulas and inequalities, some of them seemingly new, concerning Omega(n-1)/Omega(n),and (Omega(n))^2/Omega(n-1)Omega(n+1)

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