Geodesic
On the~identities of the product of normal subgroups
Fundamentalʹnaâ i prikladnaâ matematika, Tome 7 (2001) no. 3, pp. 945-949.

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The article presents the proof of the statement: the product of two normal subgroups generates a Cross-variety if and only if the intersection of Cross-varieties generated by these normal subgroups is nilpotent. 
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     author = {O. M. Lar'kina},
     title = {On the~identities of the product of normal subgroups},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
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     volume = {7},
     number = {3},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2001_7_3_a24/}
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O. M. Lar'kina. On the~identities of the product of normal subgroups. Fundamentalʹnaâ i prikladnaâ matematika, Tome 7 (2001) no. 3, pp. 945-949. http://geodesic.mathdoc.fr/item/FPM_2001_7_3_a24/