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[小资料,科普] 沃利斯 John Wallis 创造了“无穷大”符号∞ (关联:无穷小的新符号:躺倒的 0)

图1 沃利斯 John Wallis, 1616-11-23 ~ 1703-10-28, 86
一、沃利斯首现使用“无穷大”符号:∞
1655年沃利斯在名著《Arithmetica infinitorum 无穷算术》里使用了虚数、分数指数、负指数,创用 ∞ 表示无穷大。
二、罗马铭文:∞

图2
https://i.sstatic.net/4JJNG.png
A vague conjecture is that the symbol was taken from a Roman inscription containing the symbol for 100 millions
But Wallis never visited Italy. So he can hardly have seen it.
一个模糊的猜测是,这个符号取自罗马铭文,其中包含1亿的符号
但沃利斯从未访问过意大利。所以他几乎不可能看到它。
三、无穷小的新符号:2009-02-26,躺下的 0
由于无穷小不是真正的 0,因此用 0 表示无穷小容易出现混淆。
我建议
用来表示无穷小。以避免 0 和无穷小的混淆。
是躺下的0。
The confusion between infinitesimal and the true zero is caused directly by using 0 to denote infinitesimal, because infinitesimal is not 0, the true zero.
I suggest a new symbol
to denote infinitesimal. It can avoid the confusion between infinitesimal and the true zero.
is the lying down of 0.

图3 2009-02-26,我建议采用躺下的 0 作为无穷小的新符号
参考资料:
[1] 约翰·沃利斯,英国数学家,百度百科
https://baike.baidu.com/item/%E7%BA%A6%E7%BF%B0%C2%B7%E6%B2%83%E5%88%A9%E6%96%AF/5698426
提出幂的表示法并引入∞作为无限大符号,著有《圆锥曲线论》《无穷算术》《通用数学》等著作。
[2] infinity, mathematics, britannica
https://www.britannica.com/science/infinity-mathematics
infinity, the concept of something that is unlimited, endless, without bound. The common symbol for infinity, ∞, was invented by the English mathematician John Wallis in 1655. Three main types of infinity may be distinguished: the mathematical, the physical, and the metaphysical. Mathematical infinities occur, for instance, as the number of points on a continuous line or as the size of the endless sequence of counting numbers: 1, 2, 3,…. Spatial and temporal concepts of infinity occur in physics when one asks if there are infinitely many stars or if the universe will last forever.
【机器翻译】无限,是指事物是无限的、无止境的、没有界限的概念。无穷大的常用符号∞是由英国数学家约翰·沃利斯于1655年发明的。无穷大可以分为三种主要类型:数学的、物理的和形而上学的。例如,数学上的无穷大表现为一条连续线上的点的数量,或者表现为无穷计数序列的大小:1、2、3,…。当人们问是否有无限多的恒星,或者宇宙是否会永远存在时,物理学中就会出现无限的空间和时间概念。
[3] John Wallis, MacTutor
https://mathshistory.st-andrews.ac.uk/Biographies/Wallis/
Wallis developed methods in the style of Descartes analytical treatment and he was the first English mathematician to use these new techniques. This work is also famed for the first use of the symbol ∞ which was chosen by Wallis to represent a curve which one could traced out infinitely many times. He used the symbol again in the more influential work Arithmetica infinitorum which was published a few months later.
【机器翻译】沃利斯发展了笛卡尔分析处理风格的方法,他是第一位使用这些新技术的英国数学家。这项工作也以首次使用符号∞而闻名,沃利斯选择符号∞来表示一条可以无限次绘制的曲线。他在几个月后出版的更具影响力的著作《无定式算术》中再次使用了这个符号。
以前的《科学网》相关博文链接:
[1] 2022-06-30 14:26,往日(12):数学里“无穷小 infinitesimal”的新符号建议
https://blog.sciencenet.cn/blog-107667-1345282.html
[2] 2022-11-24 16:26,[建议] Let my 2012 new prefixes be used, please! 请使用我2012年建议的新词头!
https://blog.sciencenet.cn/blog-107667-1365158.html
[3] 2022-11-22 14:04,[插播,往日] 国际单位制 SI 新增 4 个“词头”(vs 中国人 10 年前的建议)
https://blog.sciencenet.cn/blog-107667-1364818.html
[4] 2012-04-19 09:47,增加 SI prefixes 的建议 (Suggestion to add the SI prefixes)
https://blog.sciencenet.cn/blog-107667-561082.html
[5] 2023-03-04 16:53,往日(18):SI “词头 prefixes”与科技话语权
https://blog.sciencenet.cn/blog-107667-1378891.html
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