...For this equation, T 3 - pT 2 -4 rT +(4 pr - q 2 )=0 ...If you take one of the roots t of (2), the roots of (1) can be obtained as the roots of the following two quadratic equations (Ferrari's solution). Also, if the three roots of are u 2 , v 2 , and w 2 , the roots of (1) are u + v + w , u - v - w , - u + v - w , and - u - v - w (Euler's solution). (e) There are no formulas like (b) and (d) for the fifth degree or higher. ... *Some of the terminology that refers to "Euler's solution" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この方程式に対して, T3-pT2-4rT+(4pr-q2)=0 ……(2) の一つの根tをとれば,(1)の根は,次の二つの二次方程式の根として得られる(フェラリの解法)。また,の3根をu2,v2,w2とすると,(1)の根は, u+v+w,u-v-w, -u+v-w,-u-v-wである(オイラーの解法)。(e)五次以上については(b)(d)のような公式はない。… ※「オイラーの解法」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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