Abstract

In the present paper we continue the investigation of the lattice of subvarieties of the variety of $${\sqrt{\prime}}$$ quasi-MV algebras, already started in [6]. Beside some general results on the structure of such a lattice, the main contribution of this work is the solution of a long-standing open problem concerning these algebras: namely, we show that the variety generated by the standard disk algebra D r is not finitely based, and we provide an infinite equational basis for the same variety.

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