[see also: affirmative]
This question was answered negatively in [5]. However, on the positive side, Davies [5] proved that ......
By allowing $f$ to have both positive and negative coefficients, we obtain ......
Here $u^+$ and $u^-$ are the positive and the negative parts of $u$, as defined in Section 5.
We show that nevertheless a positive proportion of the polynomials $B_n(x)$ satisfy Eisenstein's criterion.
However, $F$ is only nonnegative rather than strictly positive, as one may have expected.
Let $Q$ denote the set of positive definite forms (including imprimitive ones, if there are any).
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