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The sets of convergence in measure of multiple orthogonal Fourier series

机译:多重正交傅里叶级数的度量的收敛集

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摘要

Let {psi(k)(x), k = 1, 2....} be an arbitrary orthonormal system on [0, 1] that is uniformly bounded by a constant M. Let T be a subset of [0, 112 such that the Fourier series of all Lebesgue integrable functions on [0, 1](2) with respect to the product system {psi(k)(x)psi j(y), k, l = 1, 2.... } converge in measure by squares on T. The following problem is studied. How large may the measure of T be? A theorem is proved that implies that for each such system, there is mu(2)T <= 1 - M-4 (for the d-fold product systems, mu(d)T <= 1 - M-2d, d >= 2). This estimate is sharp in the class of all such product systems.
机译:令{psi(k)(x),k = 1,2 ....}是[0,1]上的任意正交系统,其均以常数M为边界。令T为[0,112]的子集这样,相对于乘积系统{psi(k)(x)psi j(y),k,l = 1,2 ...,[0,1](2)上所有Lebesgue可积函数的傅里叶级数。 }在T上以平方度量收敛。研究了以下问题。 T的大小可以是多少?证明一个定理表明,对于每个这样的系统,存在mu(2)T <= 1-M-4(对于d折积系统,mu(d)T <= 1-M-2d,d> = 2)。在所有此类产品系统的分类中,该估计值都是很高的。

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