Proposition 22.20.16. In Situation 22.20.2 the homotopy category $K(\mathcal{A})$ with its natural translation functors and distinguished triangles is a triangulated category.

**Proof.**
By Lemma 22.20.14 we know that $K(\mathcal{A})$ is pre-triangulated. Combining Lemmas 22.20.7 and 22.20.15 with Derived Categories, Lemma 13.4.14, we conclude that $K(\mathcal{A})$ is a triangulated category.
$\square$

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