Lemma 15.86.7. With notation as in Lemma 15.86.6 the long exact cohomology sequence associated to the distinguished triangle breaks up into short exact sequences

**Proof.**
The long exact sequence of the distinguished triangle is

The map in the middle has kernel $\mathop{\mathrm{lim}}\nolimits _ n H^ p(K_ n^\bullet )$ by its explicit description given in the lemma. The cokernel of this map is $R^1\mathop{\mathrm{lim}}\nolimits _ n H^ p(K_ n^\bullet )$ by Lemma 15.86.1. $\square$

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