Geodesic
On elementary and geometric equivalence of equational co-domains
Fundamentalʹnaâ i prikladnaâ matematika, Tome 22 (2019) no. 4, pp. 229-238

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We prove that the class of equational co-domains is not closed under elementary and geometric equivalence. We find corresponding counter-examples in predicate and functional languages. 
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     author = {A. N. Shevlyakov},
     title = {On elementary and geometric equivalence of equational co-domains},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {229--238},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2019_22_4_a14/}
}
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A. N. Shevlyakov. On elementary and geometric equivalence of equational co-domains. Fundamentalʹnaâ i prikladnaâ matematika, Tome 22 (2019) no. 4, pp. 229-238. http://geodesic.mathdoc.fr/item/FPM_2019_22_4_a14/