EDB — 0GH

Exercises

1. [0GH] Topics:closing. Given $X$ topological space and $A\subseteq X$, show that

   $$\bar{A}=\overline{\left(\stackrel{―}{A}\right)}$$

   or by switching to complement with respect to [0GF]↺↻, and using the definition of $\bar{A}$ like ”intersection of all the locks they contain $A$”.

   (For the case of $X$ metric space, see also [0PQ]↺↻)