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Jan 30, 2020 at 17:54 comment added Martin Brandenburg In your example, there is no such twist map. But you can work with chain complexes with such a twist map and then regard $M$ as a chain complex concentrated in degree $0$.
Jul 21, 2019 at 22:56 vote accept CommunityBot moved from User.Id=30211 by developer User.Id=481663
Jul 21, 2019 at 22:54 comment added user30211 that's right, sorry
Jul 21, 2019 at 22:47 answer added Eric Canton timeline score: 4
Jul 21, 2019 at 22:27 comment added David Roberts Is $M_0 = I$? I can't think of anything else it could be.
Jul 21, 2019 at 22:04 history asked user30211 CC BY-SA 4.0