Geodesic
Mixed idempotent Abelian groups
Fundamentalʹnaâ i prikladnaâ matematika, Tome 22 (2019) no. 5, pp. 153-157.

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An Abelian group is called idempotent if any element is idempotent for some multiplication. This paper contains a complete description of torsion-free idempotent groups and periodic idempotent groups. We also give a description of mixed idempotent groups. 
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A. G. Tisovsky. Mixed idempotent Abelian groups. Fundamentalʹnaâ i prikladnaâ matematika, Tome 22 (2019) no. 5, pp. 153-157. http://geodesic.mathdoc.fr/item/FPM_2019_22_5_a15/

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