Maximal Lindelöf locales
The author characterizes maximal Lindelöfness for subfit and regular frames in the following terms: (1) A subfit frame is maximal Lindelöf if and only if the closed sublocales of the frame are the only ones that are Lindelöf within the class of sublocales that are joins of closed sublocales. (2) A regular frame is maximal Lindelöf if and only if every join of countably many closed sublocales is closed).
scientific article; zbMATH DE number 7140996
scientific article