…On the other hand, in the 15th century, 4÷ was used to represent half in Lombard Street, the financial district of London. The first person to use ÷ for division was JH Rahn (1622-76) of Switzerland (1659). This was not widely used in continental Europe, but was used in America and England. … *Some of the terminology that mentions "Rahn, JH" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…一方,15世紀にはロンドンの金融街ロンバート街では4÷,4で半分を表したという。÷を除法に最初に使ったのはスイスのラーンJ.H.Rahn(1622‐76)である(1659)。これはヨーロッパ大陸ではあまり普及せず,アメリカ,イギリスで利用された。… ※「Rahn,J.H.」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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