Contents Introduction 1. A-module s 1 2. Chain-complexes , resolution s an d derive d functor s 1 4 3. Propertie s o f derive d functor s 2 5 4. Ex t withou t projective s an d injective s 3 5 5. Exac t couple s an d spectra l sequence s 5 0 6. Th e Grothendiec k spectra l sequenc e 6 4 v
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