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西方的方程論(theory of equations) 習慣以𝑥為未知數。
中國古書有天元術,相當於現代多項方程(polynomial equation)。當中句式「立天元為乜乜」相當於現代「設𝑥為乜乜」(Let 𝑥 be mud mud)。
所以,天元術對《代》以「天」譯「𝑥」有多少影響?🤔