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並前往https://math.berkeley.edu/~mhaiman/math256-fall13-spring14/cohomology-1_derived-cat.pdf

Notes on Derived Categories and Derived Functors - Berkeley ...

isomorphic to zero if and only if Hi(A•) = 0 for all i, that is, if A• is acyclic. Definition 1.4. The mapping cone of a homomorphism f : A• → B• is the ...

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