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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 31, No. 5, pp. 586–588, September–October, 1979.
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Samoilenko, V.G. A difference operator with infinitely many variables. Ukr Math J 31, 465–467 (1979). https://doi.org/10.1007/BF01126881
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DOI: https://doi.org/10.1007/BF01126881