Good approximation and characterization of subgroups of R = Z

Author: Bíró A.   Deshouillers J. M.   T. Sós Vera  

Publisher: Akademiai Kiado

ISSN: 0081-6906

Source: Studia Scientiarum Mathematicarum Hungarica, Vol.38, Iss.1-4, 2001-12, pp. : 97-113

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Abstract