Geodesic
On lattice-ordered monoids
Discussiones Mathematicae. General Algebra and Applications, Tome 23 (2003) no. 2, pp. 101-114

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In the paper lattice-ordered monoids and specially normal lattice-ordered monoids which are a generalization of dually residuated lattice-ordered semigroups are investigated. Normal lattice-ordered monoids are metricless normal lattice-ordered autometrized algebras. It is proved that in any lattice-ordered monoid A, a ∈ A and na ≥ 0 for some positive integer n imply a ≥ 0. A necessary and sufficient condition is found for a lattice-ordered monoid A, such that the set I of all invertible elements of A is a convex subset of A and A¯ ⊆ I, to be the direct product of the lattice-ordered group I and a lattice-ordered semigroup P with the least element 0.
Keywords: lattice-ordered monoid, normal lattice-ordered monoid, dually residuated lattice-ordered semigroup, direct decomposition, polar 
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Jasem, Milan. On lattice-ordered monoids. Discussiones Mathematicae. General Algebra and Applications, Tome 23 (2003) no. 2, pp. 101-114. http://geodesic.mathdoc.fr/item/DMGAA_2003_23_2_a1/