Definition:Quotient Topology

Definition
Let $T = \left({S, \tau}\right)$ be a topological space.

Let $\mathcal R \subseteq S \times S$ be an equivalence relation on $S$.

Let $q_\mathcal R: S \to S / \mathcal R$ be the quotient mapping induced by $\mathcal R$.

Also see

 * Quotient Topology is Topology


 * Identification Topology


 * Identification Topology equals Quotient Topology on Induced Equivalence