$(X,\tau)$ topolojik uzay olmak üzere
$$\tau=\mathcal{C}(X,\tau)\Rightarrow (X,\tau), \text{ normal uzay}.$$
$$(X,\tau),\text{normal uzay}$$
$$:\Leftrightarrow$$
$$ (\forall F,E\in\mathcal{C}(X,\tau))[F\cap E=\emptyset\Rightarrow (\exists U\in\mathcal{U}(F))(\exists V\in\mathcal{U}(E))(U\cap V=\emptyset)]$$