Song, Yan-Kui(Universitat Politècnica de València, 2009-04-01)
[EN] A space X is discretely absolutely star-Lindelöf if for every open cover U of X and every dense subset D of X, there exists a countable subset F of D such that F is discrete closed in X and St(F, U) = X, where St(F, ...
Singh, Sumit(Universitat Politècnica de València, 2022-10-03)
[EN] A space X is said to be set star-Lindelöf if for each nonempty subset A of X and each collection U of open sets in X such that A ⊆ SU, there
is a countable subset V of U such that A ⊆ St(SV, U). The class of set ...