Abstract.
A classical theorem of Schur states that if the centre of a group G has finite index, then the commutator subgroup G′ of G is finite. A lattice analogue of this result is proved in this paper: if a group G contains a modularly embedded subgroup of finite index, then there exists a finite normal subgroup N of G such that G/N has modular subgroup lattice. Here a subgroup M of a group G is said to be modularly embedded in G if the lattice \({\mathfrak{L}}(\langle x,M \rangle)\) is modular for each element x of G. Some consequences of this theorem are also obtained; in particular, the behaviour of groups covered by finitely many subgroups with modular subgroup lattice is described.
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Dedicated to Yaroslav P. Sysak on his 60th birthday
Received: 16 October 2007, Final version received: 22 February 2008
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De Falco, M., de Giovanni, F. & Musella, C. The Schur property for subgroup lattices of groups. Arch. Math. 91, 97–105 (2008). https://doi.org/10.1007/s00013-008-2624-x
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DOI: https://doi.org/10.1007/s00013-008-2624-x