Near Frattini subgroups of residually finite generalized free products of groups

Mohammad K. Azarian

International Journal of Mathematics and Mathematical Sciences, 2001, vol. 26, 1-5

Abstract:

Let G = A ★ H B be the generalized free product of the groups A and B with the amalgamated subgroup H . Also, let λ ( G ) and ψ ( G ) represent the lower near Frattini subgroup and the near Frattini subgroup of G , respectively. If G is finitely generated and residually finite, then we show that ψ ( G ) ≤ H , provided H satisfies a nontrivial identical relation. Also, we prove that if G is residually finite, then λ ( G ) ≤ H , provided: (i) H satisfies a nontrivial identical relation and A , B possess proper subgroups A 1 , B 1 of finite index containing H ; (ii) neither A nor B lies in the variety generated by H ; (iii) H < A 1 ≤ A and H < B 1 ≤ B , where A 1 and B 1 each satisfies a nontrivial identical relation; (iv) H is nilpotent.

Date: 2001
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jijmms:352892

DOI: 10.1155/S0161171201005397

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