Cantor set is uncountable

[Real Analysis] Definition of relatively open set · Each set in the subspace topology is actually...

In a metric space—that is, when a distance function is defined—open sets are the sets that, with ...

The neighborhood definition of open sets generalizes to relatively open sets. First, we define re...

If Y is closed relative to X and p is a border point relative to X, then p has a neighborhood ent...