Varieties of implicative semilattices
William C. Nemitz, Thomas P. Whaley · Pacific Journal of Mathematics · 1971
The main purpose of this paper is to investigate properties of the lattice of subvarieties of the variety of implicative semilattices.Also the distinct compositions of the operators of taking homomorphic images, subalgebras, and products of classes of implicative semilattices are determined.