# Contents

## Definition

Let $(X, \tau)$ be a topological space. Then a point $x \in X$ in the underlying set is called an open point if the singleton subset $\{x\} \in X$ is an open subset, i.e. $\{x\} \in \tau$.

Created on May 9, 2017 at 12:44:55. See the history of this page for a list of all contributions to it.