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σ -interpolation lattice-ordered groups

Michael R. Darnel — 2000

Czechoslovak Mathematical Journal

In [1], Jakubík showed that the class of σ -interpolation lattice-ordered groups forms a radical class, but left open the question of whether the class forms a torsion class. In this paper, we show that this class does indeed form a torsion class.

Subgroups and hulls of Specker lattice-ordered groups

Paul F. Conrad;  Michael R. Darnel — 2001

Czechoslovak Mathematical Journal

In this article, it will be shown that every ℓ -subgroup of a Specker ℓ -group has singular elements and that the class of ℓ -groups that are ℓ -subgroups of Specker ℓ -group form a torsion class. Methods of adjoining units and bases to Specker ℓ -groups are then studied with respect to the generalized Boolean algebra of singular elements, as is the strongly projectable hull of a Specker ℓ -group.

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