Homotopic Paths have Same Endpoints

Definition
Let $X$ be a topological space.

Let $f, g: \closedint 0 1 \to X$ be paths.

Let $f$ and $g$ be homotopic.

Then $f$ and $g$ have the same endpoints.

That is:
 * $\map f 0 = \map g 0$ and $\map f 1 = \map g 1$.