\begin{definition}[Definition:Open Point]
Let $T = \left({S, \tau}\right)$ be a topological space.
Let $p \in S$ such that $\left\{{p}\right\} \in \tau$.
That is, let $\left\{{p}\right\}$ be an open set of $T$.
Then $p$ is an open point of $T$.
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\end{definition}