Geodesic
On an open problem in the theory of modular subgroups
Journal of the Belarusian State University. Mathematics and Informatics, Tome 2 (2023), pp. 28-34.

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Let $G$ be a finite group. Then a subgroup $A$ of group $G$ is said to be modular in $G$ if $(i) \langle X,A\cap Z\rangle=\langle X,A\rangle\cap Z$ for all $X\leq G, Z\leq G$ such that $X\leq Z$, and $(ii)\langle A,Y\cap Z\rangle=\langle A,Y\rangle\cap Z$ for all $Y\leq G, Z\leq G$ such that $A\leq Z$. We obtain a description of finite groups in which modularity is a transitive relation, that is, if $A$ is a modular subgroup of $K$ and $K$ is a modular subgroup of $G$, then $A$ is a modular subgroup of $G$. The result obtained is a solution to one of the old problems in the theory of modular subgroups, which goes back to the works of A. Frigerio (1974), I. Zimmermann (1989).
Keywords: finite group; modular subgroup; submodular subgroup; $M$-group; Robinson complex. 
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L. Aming-Ming; G. Wenbin; I. N. Safonova; A. N. Skiba. On an open problem in the theory of modular subgroups. Journal of the Belarusian State University. Mathematics and Informatics, Tome 2 (2023), pp. 28-34. http://geodesic.mathdoc.fr/item/BGUMI_2023_2_a2/

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