5. Let X and Y be topological spaces and let f: X → Y. Prove that, if for every closed set B in Y, the set f-¹ (B) is cl
Posted: Wed May 04, 2022 11:12 am
5. Let X and Y be topological spaces and let f: X → Y. Prove that, if for every closed set B in Y, the set f-¹ (B) is closed in X, then fis continuous. [5]