Geodesic
On the root-class residuality of generalized free products with a~normal amalgamation
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (2015), pp. 27-44

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We obtain both necessary and sufficient conditions for the free product of two groups with normal amalgamated subgroups to be a residually $\mathcal C$-group, where $\mathcal C$ is a root class of groups, which must be homomorphically closed in most cases.
Keywords: generalized free product, residual property, root class of groups. 
@article{IVM_2015_10_a2,
     author = {E. A. Tumanova},
     title = {On the root-class residuality of generalized free products with a~normal amalgamation},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {27--44},
     publisher = {mathdoc},
     number = {10},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2015_10_a2/}
}
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E. A. Tumanova. On the root-class residuality of generalized free products with a~normal amalgamation. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (2015), pp. 27-44. http://geodesic.mathdoc.fr/item/IVM_2015_10_a2/