Onsory A and Araskhan M
In this paper, we present a relative version of the concept of lower marginal series and give some isomorphisms among ï��G-marginal factor groups. Also, we conclude a generalized version of the Stalling’s theorem. Finally, we present a sufficient condition under which the order of the generalized Baer-invariant of a pair of finite groups divides the order of the generalized Baer-invariant of its factor groups.
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