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Factor, Extension


Dear All,

What is the meaning of the help of Factor:

Factor[poly,Extension->Automatic] will extend the domain of
coefficients to include any algebraic numbers that appear in poly.  =BB

if

Factor[x^2 - 2, Extension -> Automatic]

does not seem to work in the same way as

Factor[x^2 - 2, Extension -> Sqrt[2]]

Thanks,

J=E1nos


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