Exercises
[0GH] Topics:closing. Given \(X\) topological space and \(A⊆ X\), show that
\[ \overline A= \overline{\left(\overline A\right)} \]or by switching to complement with respect to [0GF], and using the definition of \(\overline A\) like ”intersection of all the locks they contain \(A\)”.
(For the case of \(X\) metric space, see also [0PQ])