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 ...