…In 16th century Germany, x was used (called the contraction of the root radix), x 2 , x 3 , etc. This symbol was also used in England, where 5…20…―3β was used to represent 5 x 6 + 20 x 3 - 3 x 5 (R. Recorde, Whetstone of Witte, 1557). F. Viet used consonant letters B , C , D , etc. for known quantities in equations and vowel letters A , E , I , etc. for unknown quantities, and performed calculations on the equations with the letters, making general algebraic inference possible. … *Some of the terminology that mentions "Recorde, R." is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…16世紀のドイツではxに(根radixの縮約といわれる),x2に,x3になどを使った。この記号はイギリスでも使われ,5・・・20・・―3・β・で5x6+20x3-3x5を表した(1557年のレコードR.Recorde《Whetstone of Witte》)。F.ビエトは方程式の既知量に子音の文字B,C,Dなどを,未知量に母音の文字A,E,Iなどを使い,その文字の式の演算を実行し,代数学の一般的推論を可能にした。… ※「Recorde,R.」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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