Geodesic
Lattices of dominions of universal algebras
Algebra i logika, Tome 46 (2007) no. 1, pp. 26-45

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We fix a universal algebra $A$ and its subalgebra $H$. The dominion of $H$ in $A$ (in a class $\mathcal M$) is the set of all elements $a\in A$ such that any pair of homomorphisms $f,g:A\rightarrow M\in\mathcal M$ satisfies the following: if $f$ and $g$ coincide on $H$ then $f(a)=g(a)$. In association with every quasivariety, therefore, is a dominion of $H$ in $A$. Sufficient conditions are specified under which a set of dominions form a lattice. The lattice of dominions is explored for down-semidistributivity. We point out a class of algebras (including groups, rings) such that every quasivariety in this class contains an algebra whose lattice of dominions is anti-isomorphic to a lattice of subquasivarieties of that quasivariety.
Keywords: dominion, lattice of dominions, quasivariety. 
@article{AL_2007_46_1_a1,
     author = {A. I. Budkin},
     title = {Lattices of dominions of universal algebras},
     journal = {Algebra i logika},
     pages = {26--45},
     publisher = {mathdoc},
     volume = {46},
     number = {1},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2007_46_1_a1/}
}
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A. I. Budkin. Lattices of dominions of universal algebras. Algebra i logika, Tome 46 (2007) no. 1, pp. 26-45. http://geodesic.mathdoc.fr/item/AL_2007_46_1_a1/