2004/09/15 | 实例的不可约[Casus Irreducibilus]
类别(∑〖数学〗) | 评论(0) | 阅读(39) | 发表于 13:26
If P(x) is an irreducible cubic equation all of whose roots are real, then to obtain them by radicals, you must take roots of nonreal numbers at some point.


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