La categoría-base de los abiertos regulares de un espacio topológico.
La notion de fermé dans un espace de Spanier.
If X is a quasitopological space -Spanier space in this paper-, a topological space q X can be associated to X. A subset F of X is called closed if it is closed in q X. Interesting properties of the closed subspaces of a quasitopological space are examined.
Les espaces topologiques, les espaces de proximité et les espaces uniformes d'un point de vue général
L-guilds and binary L-merotopies.
Local compactness in approach spaces. I.
Local compactness in approach spaces. II.
Locally closed sets and LC-continuous functions.