Geodesic
On Fully Inert Subgroups of Completely Decomposable Groups
Matematičeskie zametki, Tome 101 (2017) no. 2, pp. 302-312.

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The completely decomposable torsion-free Abelian groups with finitely many homogeneous components for which every fully inert subgroup is commensurable with a fully invariant subgroup are described.
Keywords: fully inert subgroup, fully invariant subgroup, commensurable subgroups, completely decomposable group, index of a subgroup. 
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A. R. Chekhlov. On Fully Inert Subgroups of Completely Decomposable Groups. Matematičeskie zametki, Tome 101 (2017) no. 2, pp. 302-312. http://geodesic.mathdoc.fr/item/MZM_2017_101_2_a12/

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