Particular Point Space is Separable

Theorem
Let $T = \left({S, \vartheta_p}\right)$ be a particular point space.

Then $T$ is separable.

Proof
Consider $U := \left\{{p}\right\} \subseteq S$.

By definition, $U$ is open in $T$.

From Closure of Open Set of Particular Point Space we have that $U^- = S$, where $U^-$ is the closure of $U$.

By definition, $U$ is everywhere dense in $T$.

$U$ is (trivially) countable.

Hence the result, by definition of a separable space.