…On the other hand, there is also a theory that the use of the - symbol came about because of the custom of writing 2 yards and 3 inches as 2yd-3in, which indicates that there is no number in the feet unit (0 feet). The first book to use these + and - symbols was J. Widman's arithmetic book (1489). In it, + means excess and - means shortage. … *Some of the terminology that mentions "Widman, J." is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…他方,2ヤード3インチを2yd-3inと書いて,フィートの単位のところに数がない(0フィート)ことを示す習慣から-が利用されるようになったという説もある。これら+,-を初めて使った本はウィドマンJ.Widmanの算術書(1489)である。そこでは,+は超過を,-は不足を意味している。… ※「ウィドマン,J.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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