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The Stacks project

Example 20.29.3. Let (X, \mathcal{O}_ X) be a ringed space. Let \mathcal{F}^\bullet be a complex of \mathcal{O}_ X-modules. We can apply Lemma 20.29.1 with F^ p\mathcal{F}^\bullet = \tau _{\leq -p}\mathcal{F}^\bullet . (If \mathcal{F}^\bullet is bounded below we can use Remark 20.29.2.) Then we get a spectral sequence

E_1^{p, q} = H^{p + q}(X, H^{-p}(\mathcal{F}^\bullet )[p]) = H^{2p + q}(X, H^{-p}(\mathcal{F}^\bullet ))

After renumbering p = -j and q = i + 2j we find that for any K \in D(\mathcal{O}_ X) there is a spectral sequence (E'_ r, d'_ r)_{r \geq 2} of bigraded modules with d'_ r of bidegree (r, -r + 1), with

(E'_2)^{i, j} = H^ i(X, H^ j(K))

If K is bounded below (for example), then this spectral sequence is bounded and converges to H^{i + j}(X, K). In the bounded below case this spectral sequence is an example of the second spectral sequence of Derived Categories, Lemma 13.21.3 (constructed using Cartan-Eilenberg resolutions).


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