Proposition 8.2.4.label Let $(X, d)$ be a metric space and $A \subset X$, then
\[\ol{A}= \bigcap_{\eps > 0}B(A, \eps)\]
Proof. By Proposition 6.1.13.$\square$
Proposition 8.2.4.label Let $(X, d)$ be a metric space and $A \subset X$, then
Proof. By Proposition 6.1.13.$\square$