山巅一寺一壶酒

in #cn-malaysia5 years ago (edited)

最近开始让儿子背圆周率。

人们有很多方法来记忆圆周率,比如我小时候就记得“山巅一寺一壶酒”来记忆3.14159。

在我看来,背诵圆周率本身并没有什么意义,主要是为了看看儿子的记忆能力,顺便培养他对数字的感觉。

圆周率是圆的周长与直径的比值,用希腊字母π表示。它是一个无理数,即无限不循环小数。
image
Image from pixabay.com

一块古巴比伦石匾(约产于公元前1900年至1600年)清楚地记载了圆周率 = 25/8 = 3.125。古希腊大数学家阿基米德(公元前287–212 年) ,求出圆周率的下界和上界分别为223/71 和22/7, 并取它们的平均值3.141851 为圆周率的近似值。

公元480年左右,中国南北朝时期的数学家祖冲之计算出精确到小数点后7位的结果,给出不足近似值3.1415926和过剩近似值3.1415927,在之后的800年里祖冲之计算出的π值都是最准确的。

后来,计算机的出现,让圆周率的计算得到了很大的发展。

在1973年,Jean Guilloud和Martin Bouyer以电脑计算出了π的第一百万个小数位。

2011年10月16日,日本长野县饭田市公司职员近藤茂利用家中电脑将圆周率计算到小数点后10万亿位。

德国数学家康托说:“历史上一个国家所算得的圆周率的准确程度,可以作为衡量这个国家当时数学发展水平的指标。”

还有一种说法,说π的这一串连续不循环小数,包含了整个宇宙的奥秘。如果人类可以把π计算完成,将会掌握宇宙的奥秘,拥有长生不老的技能。

这可能是一句玩笑话,但是谁也不知道这一天是否有可能到来。科学本来就是一直在发展的,说不定真的会有那么一天呢?

不过,我是真不关心长生不老这件事。

有了孩子以后,我更加体会到了人生的乐趣,对家庭的爱与责任。这些都让我非常快乐。

此生能有家人们的陪伴,已经足够了。

人生最大的魅力就是每个人都在各自的生活中体会无限接近圆满的过程,就像π这个无限不循环小数一样。

区别就是,π没有尽头,而人生总有尽头。

死亡是生命最好的礼物。只有这样,人们才会懂得珍惜的意义。


参考:https://baike.baidu.com/item/%E5%9C%86%E5%91%A8%E7%8E%87/139930?fr=aladdin

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