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                <term xml:lang="en">Distribution of divisors</term>
                <term xml:lang="en">concentration of divisors</term>
                <term xml:lang="en">normal order</term>
                <term xml:lang="en">Hooley's function</term>
                <term xml:lang="en">Erdös-Hooley’s Delta-function</term>
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              <p>For integer n≥ 1 and real u, let ∆(n,u):=|{d:d | n, \e^u &amp;lt; d≤ \e^{u+1}}|. The Erdős--Hooley Delta-function is then defined by ∆(n):=\max_{u \in R}∆(n,u).$ For any fixed integer r ≥ 2 and any irreducible polynomial F\in Z[X], we estimate the normal order of  ∆(|F(n)|^r) to within factors that are slowly varying functions of log n. This is then applied to determine with the same precision the normal order of ∆(|F(n)|) for any polynomial F with integer coefficients. We also evaluate some weighted average orders of ∆(n^r) and apply the result to bounding short sums of ∆(|F(n)|) for general F\in Z[X].</p>
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