Abstract
Пусть $\alpha_{m}$ и $\beta_{n}$ --- две последовательности вещественных чисел с носителями наотрезках $[M,2M]$ и $[N,2N]$, где $M = X^{1/2-\delta}$ и $N = X^{1/2+\delta}$. Мы доказываемсуществование такой постоянной $\delta_{0}$, что мультипликативная свертка$\alpha_{m}$ и $\beta_{n}$ имеет уровень распределения $1/2+\delta-\varepsilon$ (в слабом смысле),если только $0\leqslant \delta<\delta_{0}$, последовательность $\beta_{n}$ являетсяпоследовательностью Зигеля-Вальфиша, и обе последовательности $\alpha_{m}$ и $\beta_{n}$ограничены сверху функцией делителей.Наш результат, таким образом, представляет собой общую дисперсионную оценкудля "коротких"\, сумм II типа. Доказательство существенно использует дисперсионный метод Линникаи недавние оценки трилинейных сумм с дробями Клоостермана, принадлежащие Беттин и Чанди.Также мы остановимся на применении полученного результата к проблеме делителей Титчмарша.
Highlights
An important theme in analytic number theory is the study of the distribution of sequences in arithmetic progressions
For M and N ≥ 1, we put X = M N and L = log 2X. Whenever it appears in the subscript of a sum the notation n ∼ N will means N ≤ n < 2N
Throughout η will denote any positive number the value of which may change at each occurence
Summary
An important theme in analytic number theory is the study of the distribution of sequences in arithmetic progressions. The method relies crucially on the bilinearity of the problem, followed by the use of various estimates for Kloosterman sums of analytic or algebraic origins. For a bound such as (3) to hold one needs to impose a “Siegel-Walfisz condition” on at least one of the sequences αm or βn. When Q > X1/2+ε for some ε > 0, there are only a few results establishing (3) unconditionally in specific ranges of M and N (precisely [9, Theoreme 1], [3, Theorem 3], [11, Corollaire 1], [12, Corollary 1.1 (i)]). 1 follows closely the proof of the conditional result in [8, Theoreme 1] up to the point where Hooley’s.
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