Geodesic
On projective invariant subgroups of abelian groups
Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika, no. 1 (2009), pp. 31-36
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There are chosen some types of projective invariant subgroups of abelian groups, which being fully invariant. The separable torsion-free groups in which all projective invariant subgroups are fully invariant are described.
Keywords: fully invariant subgroup, projective invariant subgroup. 
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A. R. Chekhlov. On projective invariant subgroups of abelian groups. Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika, no. 1 (2009), pp. 31-36. http://geodesic.mathdoc.fr/item/VTGU_2009_1_a4/

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