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Oct 24, 2011 at 2:52 comment added AlgRev @Mariano Suárez-Alvarez: I am just a starter of comm. and homological algebra. Do I understand $Hom_S (K[x,S],S)$ correctly? Thank you for your patience.
Oct 24, 2011 at 2:45 comment added Mariano Suárez-Álvarez Just write down what the complex $\hom_S(K[x,S],S)$ is, using the fact that the dual of a free module of rank $1$ is of free of rank $1$.
Oct 24, 2011 at 2:35 history asked AlgRev CC BY-SA 3.0