Varieties of three-valued Heyting algebras with a quantifier
This paper is devoted to the study of some subvarieties of the variety \({\mathbf Q}\) of \(Q\)-Heyting algebras, namely Heyting algebras with a quantifier. Particular emphasis is on the variety \({\mathbf Q}_3\) of three-valued \(Q\)-Heyting algebras in which the subdirectly irreducibles are determined along with the lattice of subvarieties.
scientific article; zbMATH DE number 1513062