7:21If f is a continuous function between topological spaces and X is compact, then f(X) is compactNick Ziemkiewicz122 views·1 year ago
11:57If K is a closed subset of a compact topological space X, then K is compactNick Ziemkiewicz23 views·1 year ago
16:47A is dense in X iff every nonempty open subset of X intersects A nontriviallyNick Ziemkiewicz43 views·1 year ago
