A Hajós type result on factoring finite abelian groups by subsets. II
Keresztély Corrádi, Sándor Szabó (2010)
Commentationes Mathematicae Universitatis Carolinae
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It is proved that if a finite abelian group is factored into a direct product of lacunary cyclic subsets, then at least one of the factors must be periodic. This result generalizes Hajós's factorization theorem.