# Is a characteristic map in CW complex a quetient map?

Let $X$ be a CW complex and $\Phi : D \rightarrow \bar e$ be the characteristic map for an open cell $e$.

I wonder whether $\Phi$ is a quotient map. I konw it is surjective. But I cannot prove that $\bar e$ has the quotient topology induced by $\Phi$. I can not find a counter example for this.

If it is true, I want a proof. If not, a counter example.

I saw two different definitions of Weak topology. One is that $A \subset X$ is open if and only if $A \cap \bar e$ is open for each $e$[Lee's Topological manifolds]. The other is that $A \subset X$ is open if and only if $\Phi ^{-1}(A)$ is open for each $\Phi$[Brendon's Toplogy and Geometry]. If these are equivalent, it implies,I think, that $\Phi$ is a quotient map.
$\Phi$ is surjective and closed, hence is a quotient map.
Note that the closed sets in its domain are compact so are sent by $\Phi$ to compact sets wich on their turn are closed set in its codomain wich is Hausdorff.