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The greatest proper variety of \(m\)-groups. (Russian, English) Zbl 1062.08011
Algebra Logika 42, No. 5, 624-635 (2003); translation in Algebra Logic 42, No. 5, 349-355 (2003).
It is proved that the variety of all normal-valued \(m\)-groups is the greatest proper subvariety in the lattice of all \(m\)-varieties.

MSC:
08B15 Lattices of varieties
06F15 Ordered groups
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