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11.4 (1990)

Solved

Is it true that the lattice of centralizers in a group is modular if it is a sublattice of the lattice of all subgroups? This is true for finite groups.

Contributor: V. A. Antonov

Progress

No, not always (V. N. Obraztsov, J. Algebra, 199, no. 1 (1998), 337–343).

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