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I have polished category of chain complexes a little more and started a section (but unfinished) with discussion of that and how $Ch_\bullet(\mathcal{A})$ is itself again an abelian category
There seems to be some confusion (including my confusion!) as to the usual notation for ‘bounded above’ chain complexes, etc., on the page category of chain complexes , when I compare the notation with Weibel (and several others). Weibel (page 3) uses $Ch_{-}$ for bounded above , $Ch_{+}$ for bounded below.
added pointer to:
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