Negaciones en retículos completos.
Note on algebraic interior systems
We get an interrelation between an algebraic closure system and its conjugated interior system. We introduce the concept of algebraic interior system and we get its representation.
Note on dense covers in the category of locales
In this note we are going to study dense covers in the category of locales. We shall show that any product of finitely regular locales with some dense covering property has this property as well.
Note on the center of a lattice
Notes on lattices of frame tolerances