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贵金属比例

贵金属比例贵金属分割(英语:metallic ratio)定义为

(n为自然数)

所表示的比率。

值的不同,又称为贵金属比例贵金属分割。特别地,第1贵金属比例称为黄金比例、第2贵金属比例称为白银比例、第3贵金属比例称为青铜比例[1]

贵金属数

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贵金属数
0 1 1
1 1.6180339887...
2 2.4142135623...
3 3.3027756377...
4 4.2360679774...
5 5.1925824035...
6 6.1622776601...
7 7.1400549446...
8 8.1231056256...
9 9.1097722286...
n

贵金属数

二次方程式的正根。

连分数

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贵金属数的连分数表示是:

数列的商的极限

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黄金数(第1贵金属数)是斐波那契数列相邻两项的比的极限,白银数(第2贵金属数)是佩尔数列相邻两项的比的极限;一般地,也存在以第贵金属数为相邻两项的比的极限的数列。

数列递推关系式

一旦定义了此关系式,则在此之中,第贵金属数为,有

成立。在这种情况下,这个序列的两个相邻项的商数在收敛于。即

成立。

参考文献

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  1. ^ # デザインの基礎、黄金比から大和比、第2黄金比まで. [2012年11月1日]. (原始内容存档于2021年2月27日) (日语). 

参见

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贵金属比例
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