Universal Property of Quotient Space

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Let $X$ and $Y$ be topological spaces.

Let $\sim$ be an equivalence relation on $X$.

Let $\pi : X \to X/\sim$ be the quotient mapping.

Let $f : X \to Y$ be continuous and $\sim$-invariant.

Then there exists a unique continuous map $\overline f : X/\!\sim \to Y$ such that $f = \overline f \circ \pi$.


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