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On Fourier coefficients and transforms of functions of two variables. (English) Zbl 0278.42005


MSC:

42A16 Fourier coefficients, Fourier series of functions with special properties, special Fourier series
42A38 Fourier and Fourier-Stieltjes transforms and other transforms of Fourier type
42B05 Fourier series and coefficients in several variables