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Answer by John Rognes for Is this an instance of the snake lemma?
Splice the left ends of the kernel-cokernel exact sequences$0 \to \ker(f) \to \ker(gf) \to \ker(g) \to \mathrm{cok}(f) \to \mathrm{cok}(gf) \to \mathrm{cok}(g) \to 0$and$0 \to \ker(g) \to \ker(kg) \to...
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Is this an instance of the snake lemma?
I recently had need of the following fact (in the category of abelian groups, but I'm pretty sure it holds for all abelian categories): given a commutative diagram of the form(quiver link), thus $k...
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