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Results tagged with long-exact-sequence
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user 460592
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Zeros of higher Ext functors
If your category has enough projectives, choose a projective resolution of $M$, and write $\Omega^nM$ for the $n$th kernel in this resolution, say $$0 \to \Omega^nM \to P_{n-1} \to \cdots \to P_1\to P …
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