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All subvarieties of $${\mathcal L}_{pq}$$ have finite bases of identities. (Russian, English) Zbl 1033.20027
Sib. Mat. Zh. 44, No. 3, 636-649 (2003); translation in Sib. Math. J. 44, No. 3, 500-510 (2003).
The author considers the varieties of lattice ordered groups with the identity of commutation of the $$n$$-th powers of elements. He establishes that every such $$\ell$$-variety with $$n=pq$$, where $$p$$ and $$q$$ are distinct prime numbers, has a finite basis of identities.
##### MSC:
 20E10 Quasivarieties and varieties of groups 06F15 Ordered groups 20F60 Ordered groups (group-theoretic aspects) 08B15 Lattices of varieties
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