現代数学の系譜 カントル 超限集合論他 3

314 ：１３２人目の素数さん：2021/11/12(金) 18:52:06.67 ID:WtkGTe5w.net

「不等号 ＞、＜ について」
英語では Greater-than sign、Less-than sign らしい（下記）
1560s年頃とか、1631年の文献があるらしい
ところで、日本語では、以下と以上、未満と超え があるよね

0以下： ≦0
0以上： 0≦
0未満： ＜0
0超え： 0＜

不等号の左右揃う必要ないよね
自然な日本語と対応しているよね

実数Rを考えたら、
こっちが、正解じゃね？ｗ

参考
https://en.wikipedia.org/wiki/Greater-than_sign
Greater-than sign
The greater-than sign is a mathematical symbol that denotes an inequality between two values. The widely adopted form of two equal-length strokes connecting in an acute angle at the right, >, has been found in documents dated as far back as the 1560s.

History
The earliest known use of the symbols < and > is found in Artis Analyticae Praxis ad Aequationes Algebraicas Resolvendas (The Analytical Arts Applied to Solving Algebraic Equations) by Thomas Harriot, published posthumously in 1631. The text states: "Signum majoritatis ut a > b significet a majorem quam b (The sign of majority a > b indicates that a is greater than b)" and "Signum minoritatis ut a < b significet a minorem quam b (The sign of minority a < b indicates that a is less than b)."

https://en.wikipedia.org/wiki/Less-than_sign
Less-than sign