Continuous Image of Connected Space is Connected/Corollary 2

Corollary to Continuous Image of Connected Space is Connected
Let $T$ be a connected topological space.

Let $f: T \to \R$ be a continuous real-valued mapping.

Then $f \left({T}\right)$ is a real interval.

Proof
From Continuous Image of Connected Space is Connected, the continuous image of the connected space $T$ is connected.

The result follows from Only Intervals are Connected.