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May 25, 2020 at 15:42 vote accept Dat Minh Ha
May 24, 2020 at 19:52 comment added Dmitri Pavlov @DatMinhHa: This is explained in the link to the nLab that you yourself cited in the main post: ncatlab.org/nlab/show/…
May 24, 2020 at 19:43 comment added Dat Minh Ha Why do we know that $u(M)$ is the square-zero extension of some $R$-module $M'$ ?
May 24, 2020 at 18:16 history answered Dmitri Pavlov CC BY-SA 4.0