Abstract
We study multiple trigonometric Fourier series of functions f in the classes \(L_p \left( {\mathbb{T}^N } \right)\), p > 1, which equal zero on some set \(\mathfrak{A}, \mathfrak{A} \subset \mathbb{T}^N , \mu \mathfrak{A} > 0\) (µ is the Lebesgue measure), \(\mathbb{T}^N = \left[ { - \pi ,\pi } \right]^N\), N ≥ 3. We consider the case when rectangular partial sums of the indicated Fourier series S n (x; f) have index n = (n 1, ..., n N ) ∈ ℤN, in which k (k ≥ 1) components on the places {j 1, ..., j k } = J k ⊂ {1, ..., N} are elements of (single) lacunary sequences (i.e., we consider multiple Fourier series with J k -lacunary sequence of partial sums). A correlation is found of the number k and location (the “sample” J k ) of lacunary sequences in the index n with the structural and geometric characteristics of the set \(\mathfrak{A}\), which determines possibility of convergence almost everywhere of the considered series on some subset of positive measure \(\mathfrak{A}_1\) of the set \(\mathfrak{A}\).
реэюме
В работе иэучаются кратные тригонометрические ряды Фурье функций f иэ классов \(L_p \left( {\mathbb{T}^N } \right)\), p> 1, равных нулю на некотором множестве \(\mathfrak{A}, \mathfrak{A} \subset \mathbb{T}^N , \mu \mathfrak{A} > 0\) (µ — мера Лебега), \(\mathbb{T}^N = \left[ { - \pi ,\pi } \right]^N\), N ≥ 3. Рассматривается случай, когда прямоугольные частичные суммы S n (x; f) укаэанных рядов Фурье имеют «номер» n = (n 1, ..., n N ) ∈ ℤN, в котором k (k ≥ 1) компонент на местах {j 1, ..., j k = J k ⊂ {1, ..., N} являются элементами (однократных) лакунарных последовательностей (т.е. рассматриваются кратные ряды Фурье с J k -лакунарной последовательностью частичных сумм). Установлена вэаимосвяэь количества (число k) и местоположения («выборка» J k ) лакунарных последовательностей в «номере» n со структурно-геометрическими характеристиками множества \(\mathfrak{A}\), определяюшая воэможность сходимости почти всюду на некотором подмножестве положительной меры \(\mathfrak{A}_1\) множества \(\mathfrak{A}\) рассматриваемых рядов.
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This work is supported by grant 11-01-00321 of Russian Foundation for Basic Research.
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Bloshanskii, I.L., Lifantseva, O.V. Structural and geometric characteristics of sets of convergence and divergence of multiple Fourier series with J k -lacunary sequence of rectangular partial sums. Anal Math 39, 93–121 (2013). https://doi.org/10.1007/s10476-013-0202-3
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DOI: https://doi.org/10.1007/s10476-013-0202-3