Geodesic
Horizontal sums of basic algebras
Discussiones Mathematicae. General Algebra and Applications, Tome 29 (2009) no. 1, pp. 21-33

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The variety of basic algebras is closed under formation of horizontal sums. We characterize when a given basic algebra is a horizontal sum of chains, MV-algebras or Boolean algebras.
Keywords: Basic algebra, horizontal sum, chain basic algebra, MV-algebra, Boolean algebra 
Chajda, Ivan. Horizontal sums of basic algebras. Discussiones Mathematicae. General Algebra and Applications, Tome 29 (2009) no. 1, pp. 21-33. http://geodesic.mathdoc.fr/item/DMGAA_2009_29_1_a1/
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