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《吴军数学通识讲义》学习笔记-7

  • 2026-04-19 08:56:38
《吴军数学通识讲义》学习笔记-7

1.4黄金分割:数学和美学的桥梁

1,最先提出黄金分割的人

毕达哥拉斯与铁匠铺的传说:公元前6世纪,毕达哥拉斯路过一家铁匠铺,被里面叮叮当当的打铁声吸引。他驻足细听,发现铁锤敲击的节奏格外悦耳。这位"万物皆数"的信徒当即掏出工具,把这段和谐的音程转化为数学比例——据说,这就是黄金分割的雏形。当然这只是一个传说,但毕达哥拉斯学派确是最早研究比例与和谐的关系,就象音阶的分配就与整数比有关系,所以音乐的美离不开黄金分割比。

毕达哥拉斯学派在五角星中发现了一神秘数字:将一条线段分为两部分,使较长部分与全长的比,等于较短部分与较长部分的比,这个比值约为0.618(或其倒数1.618)。

2,欧多克索斯与欧几里得的接力

公元前4世纪,数学家欧多克索斯第一个对这一比例进行系统研究,创造了"比例论"。公元前300年左右,欧几里得在《几何原本》中吸收前人成果,用尺规作图详细讲解了黄金分割的作法,使这部著作成为最早有关黄金分割的数学论著。下图为尺规做线段AB的黄金分割点。

3,"黄金分割"这个名字出现得很晚

16世纪卢卡·帕西奥利提出“神对比例”,17世纪开普勒称为“神对分割”,与勾股定理并列“几何学两大瑰宝”。直到19世纪,“黄金分割”开始广泛使用。20世纪,希腊字母希腊字母φ(phi) 成为黄金分割比值的标准记号,纪念设计帕特农神庙的雕塑家菲迪亚斯。

4,数学之美:φ 的独特性质

黄金分割比φ = (1+√5)/2 ≈ 1.6180339887...是一个无理数,这意味着:

它不能表示为两个整数的比,小数位无限不循环,满足方程φ² = φ + 1

奇妙的自相似性

φ 有一个迷人的特性:φ = 1 + 1/φ

这使得它可以展开为无限连分数

它还可以写成无限根式:由φ² = φ + 1两边开方:φ= √(1 + φ)

φ 写成无限重开平方的形式,只需一行极简等式:

φ = √(1 + √(1 + √(1 + √(1 + …))))

这种"自我嵌套"的结构,在数学中极为神奇罕见。

5,斐波那契数列里的“黄金比”

1202年,意大利比萨。 一位名叫莱昂纳多·皮萨诺的数学家出版了一部影响深远的著作——《算盘全书》。这位后来以绰号"斐波那契"的学者,最重要的贡献其实并非"发现"了这个数列,而是将阿拉伯数字系统引入欧洲。我们今天习以为常的0、1、2、3……9,在13世纪的意大利还是新鲜事物。斐波那契随父亲在北非经商期间,深刻体会到这种"印度-阿拉伯记数法"在商业计算中的便捷。他的《算盘全书》正是为了推广这套数字系统而作——而著名的"兔子问题",不过是书中众多题之一。

《算盘全书》中的原题如下:

假设一对刚出生的小兔一个月后能长成大兔,再过一个月便能生下一对小兔,此后每月生一对。若一年内无死亡,一对初生小兔可繁殖成多少对?

逐月推算,得到著名的斐波那契数列:1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144...

关键发现:相邻两项之比——2/3, 3/5, 5/8, 8/13, 13/21... 逐渐趋近于φ

有人用小正方形来绘制这样的矩形,惊讶的发现与等角螺旋线很相似,所以斐波那契数列里隐藏着“黄金密码”

6,自然界中的“斐波那契数”

向日葵花盘是最经典的例子:顺时针螺旋34条,逆时针55条34/55 ≈ 0.618。更大的花盘则呈现 55/8989/144——都是相邻的斐波那契数。

鹦鹉螺的外壳呈对数螺线,与"黄金螺旋"(由斐波那契正方形构造的近似曲线)惊人相似。但科学上需注意:并非所有鹦鹉螺都严格符合,自然界更多是"近似优化"而非"精确数学"。

像向日葵和鹦鹉螺等自然现象,其实是自然选择"发现"了这一数学规律,而非刻意遵循某种"美学法则"。

7,建筑,艺术,摄影中的“黄金身影”

帕特农神庙(公元前5世纪)是常被引用的经典图例。

·芬奇《蒙娜丽莎》的构图

摄影构图“三分法”

设计中的应用
8,最后说一点数学思考
大自然中的“黄金现象”很多是近似的,比如台风或者银河系的形状并不是等角螺旋线的严格图象。还有,从心理学实验中发现,黄金比值并非最美的真理。人们对于比例的偏好是有差异的,只能说是众多好看之一吧。
黄金比值φ的真正价值在于:一个简单的比例关系,竟能串联起几何,代数,数论,自然现象与人文艺术,成为人类理性追求“和谐”与“秩序”的象征。(最后这句是AI总结的)

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  1. CONNECT:[ UseTime:0.000492s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000719s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000321s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000274s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000482s ]
  6. SELECT * FROM `set` [ RunTime:0.000215s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000592s ]
  8. SELECT * FROM `article` WHERE `id` = 463090 LIMIT 1 [ RunTime:0.000438s ]
  9. UPDATE `article` SET `lasttime` = 1776636651 WHERE `id` = 463090 [ RunTime:0.008224s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000231s ]
  11. SELECT * FROM `article` WHERE `id` < 463090 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000426s ]
  12. SELECT * FROM `article` WHERE `id` > 463090 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002314s ]
  13. SELECT * FROM `article` WHERE `id` < 463090 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005419s ]
  14. SELECT * FROM `article` WHERE `id` < 463090 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002031s ]
  15. SELECT * FROM `article` WHERE `id` < 463090 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001364s ]
0.091730s