Article
Keywords:
$d$-ideals; $d$-group; directed group; lattice-ordered groups; torsion class; radical class
Summary:
This paper deals with a question concerning $d$-ideals of $d$-groups which was proposed by V. M. Kopytov and Z. J. Dimitrov. We shall also investigate a class of $d$-groups which is in a certain sense near to the class of all lattice ordered groups.
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