(i) | $E \subseteq X$ is a D78: Subset of $X$ |
(i) | $E \subseteq X$ is a D78: Subset of $X$ |
▶ | Set exterior |
▶ | Topologically nowhere dense set |
▶ | Every point in open set is an interior point |
▶ | Open set is its own interior |
▶ | Set is a superset to its interior |