Consider a quadratic formwith
and discriminant
We know that f factors as a product of linear formswith rational coefficients if and only if D is a square.
Under which conditions forare
?
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Consider a quadratic form
We know that f factors as a product of linear forms
Under which conditions for
You might want to use Gauss's Lemma.
I don't get Gauss lemma and I don't see how to use it here.