Geodesic
Uniquely covered radical classes of $\ell$-groups
Czechoslovak Mathematical Journal, Tome 51 (2001) no. 3, pp. 473-476.

Voir la notice de l'article provenant de la source Czech Digital Mathematics Library

It is proved that a radical class $\sigma $ of lattice-ordered groups has exactly one cover if and only if it is an intersection of some $\sigma $-complement radical class and the big atom over $\sigma $.
Classification : 06E08, 06F15
Keywords: radical class; atom; unique covering question; quasi-complement radical class; $\sigma $-homogeneous 
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     title = {Uniquely covered radical classes of $\ell$-groups},
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Zhang, Y.; Wang, Y. Uniquely covered radical classes of $\ell$-groups. Czechoslovak Mathematical Journal, Tome 51 (2001) no. 3, pp. 473-476. http://geodesic.mathdoc.fr/item/CMJ_2001__51_3_a2/