Geodesic
On quasi-equational bases for differential groupoids and unary algebras
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 14 (2017), pp. 1330-1337.

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As is known, there exist $2^\omega$ quasivarieties of differential groupoids and unary algebras with no independent quasi-equational basis. In the present article, we show that there exist $2^\omega$ such quasivarieties with an $\omega$-independent quasi-equational basis. We also find a recursive independent quasi-equational basis for the intersection of those quasivarieties.
Keywords: quasivariety, quasi-equational basis, differential groupoid, unary algebra. 
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A. V. Kravchenko; A. M. Nurakunov; M. V. Schwidefsky. On quasi-equational bases for differential groupoids and unary algebras. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 14 (2017), pp. 1330-1337. http://geodesic.mathdoc.fr/item/SEMR_2017_14_a40/

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