Preradical and kernel functors over categories of \(S\)−acts

Abstract

We concider the big lattices of preradicals and kernel functors over some cathegories of centered \(S-\)acts, where \(S\) is monoid whit zero. We prove that those big lattices are two elements if and only if monoid \(S-\) is groups with zero. A subset of a Rees generated pretorsion theory is a subquantale of quantale of pretorsion theory.