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Squarefree values of polynomial discriminants I

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arxiv 1611.09806 v3 pith:4AV5UVIH submitted 2016-11-29 math.NT

classification math.NT
keywords densitypolynomialsdegreediscriminantgivenintegerlowermonic
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abstract

We determine the density of monic integer polynomials of given degree $n>1$ that have squarefree discriminant; in particular, we prove for the first time that the lower density of such polynomials is positive. Similarly, we prove that the density of monic integer polynomials $f(x)$, such that $f(x)$ is irreducible and $\mathbb Z[x]/(f(x))$ is the ring of integers in its fraction field, is positive, and is in fact given by $\zeta(2)^{-1}$. It also follows from our methods that there are $\gg X^{1/2+1/n}$ monogenic number fields of degree $n$ having associated Galois group $S_n$ and absolute discriminant less than $X$, and we conjecture that the exponent in this lower bound is optimal.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. A zero density estimate for Dedekind zeta functions

    math.NT 2019-09 conditional novelty 8.0 of 10

    A zero density estimate for Dedekind zeta functions over families of Galois extensions with fixed Galois group is proved without assuming the strong Artin conjecture.

  2. Monogenic trinomials with non-squarefree discriminant

    math.NT 2019-08 conditional novelty 7.0 of 10

    New infinite families and explicit asymptotic densities of monogenic trinomials x^n + A x^m + A with non-squarefree discriminant, plus a conditional construction for A != B.

  3. Discriminants of Fields Generated by Polynomials of Given Height

    math.NT 2019-08 conditional novelty 6.0 of 10

    New upper bounds on how many monic integer polynomials of degree n and height H share a fixed field discriminant, plus improved lower bounds for distinct discriminants from trinomials.

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