Abstract
We give sufficient conditions for the convergence of the double Fourier integral of a complex-valued function f ∈ L 1(ℝ2) with bounded support at a given point (x 0,y 0) ∈ ℝ2. It turns out that this convergence essentially depends on the convergence of the single Fourier integrals of the marginal functions f(x,y 0), x ∈ ℝ, and f(x 0,y), y ∈ ℝ, at the points x:= x 0 and y:= y 0, respectively. Our theorem applies to functions in the multiplicative Zygmund classes of functions in two variables.
Abstract
Установлены достаточные условия сходимости в точке (x 0,y 0) ∈ ℝ2 двойных интегралов Фурье комплексноэначных функций f ∈ L 1 (ℝ2) с ограниченным носителем. Окаэалось, что зта сходимость по сушсцеству эависит от сходимости обычных нтегралов Фурье функций f(x,y 0), x ∈ ℝ и f(x 0, y), y ∈ ℝ в точках x:= x 0, и соответственно y:= y 0. Приведены приложения докаэанной теоремы к мультипликативным классам Зигмунда функций двух переменных.
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References
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E. M. Stein and G. Weiss, Introduction to Fourier Analysis in Euclidean Spaces, Princeton Univ. Press (Princeton, New Jersey, 1971).
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This research was supported by the Hungarian National Foundation for Scientific Research under Grant T 046 192; and it was completed while the author was a visiting professor at the Department of Mathematics, Texas A&M University, College Station during the fall semester in 2005.
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Móricz, F. A Dini type test on the pointwise convergence of double Fourier integrals. Anal Math 33, 45–54 (2007). https://doi.org/10.1007/s10474-007-0104-3
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DOI: https://doi.org/10.1007/s10474-007-0104-3