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Cone of a morphism in an abelian category when considered as a morphism in derived category. Connection between 4-term exact sequences and distinguished triangles.

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Reference request - CDGA vs. sAlg in char. 0

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how to make the category of chain complexes into an $\infty$-category

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Reference request: an algebraic stack whose closed points have no automorphisms is an algebraic space

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Reference for the derived category of $X$, $[X/G]$ and $X/G$

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surjective morphism of schemes or epimorphism of sheaves?

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Lie Algebra of Group Scheme