Geodesic
On the elementary geometry of universal algebras and on the equivalence of clones relative to this geometry
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 15 (2018), pp. 332-337.

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We study the elementary closure operation on subsets of universal algebras induced by elementary geometries of this algebras along with the equivalence relation on functional clones with respect to the equality of their elementary geometries.
Keywords: elementary types, elementary geometries of algebras, functional clones. 
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A. G. Pinus. On the elementary geometry of universal algebras and on the equivalence of clones relative to this geometry. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 15 (2018), pp. 332-337. http://geodesic.mathdoc.fr/item/SEMR_2018_15_a10/

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