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Projectivities of free products. (English) Zbl 0245.20031

MSC:
20E15 Chains and lattices of subgroups, subnormal subgroups
20E06 Free products of groups, free products with amalgamation, Higman-Neumann-Neumann extensions, and generalizations
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References:
[1] Baer , A. : The significance of the system of subgroups for the structure of the group , American Journal of Mathematics , 61 ( 1939 ) 1 - 44 . JFM 65.0060.01 · Zbl 0020.34704
[2] Kurosh , A. : The Theory of Groups , Vols. I and II , Chelsea , New York , 1960 . MR 109842 · Zbl 0094.24501
[3] Sadovsky , E.L. (ALSO SADOVSKI, SADOVSKII): a) Structural isomorphisms of free groups and free products , Mat. Sbornik 14 ( 56 ) ( 1944 ) 145 - 173 . b) On structural isomorphism of free products of groups , Mat. Sbornik 21 ( 63 ) ( 1947 ), 63 - 82 . MR 11687
[4] Suzuki , M. : Structure of a Group and the Structure of its Lattice of Subgroups , Springer Verlag , Berlin , 1956 . MR 83487 | Zbl 0070.25406 · Zbl 0070.25406
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