The work in question has as its main objective to be an alternative material for the reader who seeks to start his studies in Homological Algebra. Here we will study the structures on sets called modules, an algebraic ...

Apresentamos as Álgebras Geométricas (ou de Clifford) com o intuito de minimizar a dicotomia Geometria-Álgebra. Apresentamos tais Álgebras Geométricas sobre Rn de maneira axiomática e exploramos interpretações geométricas ...

In this article, we explore in some detail the free and weakly projective objects of the variety of Łukasiewicz implication algebras (the implicative subreducts of MV-algebras). We review the two already known descriptions ...

The aim of this paper is to investigate the variety of symmetric closure algebras, that is, closure algebras endowed with a De Morgan operator. Some general properties are derived. Particularly, the lattice of subvarieties ...

In this paper we present a category equivalent to that of tense Nelson algebras.The objects in this new category are pairs consisting of an IKt-algebra and a Boolean IKtcongruenceand the morphisms are a special kind of ...