Geodesic
On Jonsson varieties and quasivarieties
Vestnik Tverskogo gosudarstvennogo universiteta. Seriâ Prikladnaâ matematika, no. 4 (2022), pp. 5-10 Cet article a éte moissonné depuis la source Math-Net.Ru

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Earlier the notion of a Jonsson varieties and quasivarieties was introduced. For these classes of algebraic structures various assertions were proven by some researchers. We show that Jonsson varieties and quasivarieties are exactly classes of sets or pointed sets, it depends on signature. Thus, the results from the works mentioned above are trivial.
Keywords: variety, quasivariety, Jonsson theory. 
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S. M. Dudakov. On Jonsson varieties and quasivarieties. Vestnik Tverskogo gosudarstvennogo universiteta. Seriâ Prikladnaâ matematika, no. 4 (2022), pp. 5-10. http://geodesic.mathdoc.fr/item/VTPMK_2022_4_a0/

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