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arXiv 1908.05598math.NT
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关于带同余条件的除数问题

On the divisor problem with congruence conditions

Lirui Jia, Wenguang Zhai, Tianxin Cai

摘要:

设$d(n; r_1, q_1, r_2, q_2)$是满足$n_i\equiv r_i\pmod{q_i}$($i=1,2$)的分解数,$Δ(x; r_1, q_1, r_2, q_2)$是$d(n; r_1, q_1, r_2, q_2)$与$x\geq (q_1q_2)^{1+\varepsilon}, 1\leq r_i\leq q_i$和$(r_i, q_i)=1$($i=1, 2$)的和函数的误差项.我们研究了$Δ(x; r_1, q_1, r_2, q_2)$的幂矩和符号变化,证明了对于足够大的常数$C$,$Δ(q_1q_2x; r_1, q_1, r_2, q_2)$在区间$[T,T+C\sqrt{T}]$内改变符号.同时,我们证明了对于一个小的常数$c'$,存在无穷多个长度为$c'\sqrt{T}\log^{-7}T$的子区间$[T,2T]$,其中$\pm Δ(q_1q_2x; r_1, q_1, r_2, q_2)> c_5x^\frac{1}{4}$总是成立.

英文摘要:

Let $d(n; r_1, q_1, r_2, q_2)$ be the number of factorization $n=n_1n_2$ satisfying $n_i\equiv r_i\pmod{q_i}$ ($i=1,2$) and $Δ(x; r_1, q_1, r_2, q_2)$ be the error term of the summatory function of $d(n; r_1, q_1, r_2, q_2)$ with $x\geq (q_1q_2)^{1+\varepsilon}, 1\leq r_i\leq q_i$, and $(r_i, q_i)=1$ ($i=1, 2$). We study the power moments and sign changes of $Δ(x; r_1, q_1, r_2, q_2)$, and prove that for a sufficiently large constant $C$, $Δ(q_1q_2x; r_1, q_1, r_2, q_2)$ changes sign in the interval $[T,T+C\sqrt{T}]$ for any large $T$. Meanwhile, we show that for a small constant $c'$, there exist infinitely many subintervals of length $c'\sqrt{T}\log^{-7}T$ in $[T,2T]$ where $\pm Δ(q_1q_2x; r_1, q_1, r_2, q_2)> c_5x^\frac{1}{4}$ always holds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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