In[1]:= p[x_] = x^4 - 1
Out[1]= -1 + x^4
In[2]:= Factor[p[x]] % 实数域范围内
Out[2]= (-1 + x) (1 + x) (1 + x^2)
In[3]:= Factor[p[x], Extension -> I] % 复数域范围内
Out[3]= (-1 + x) (-I + x) (I + x) (1 + x)
https://blog.sciencenet.cn/blog-287000-537303.html
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