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Apr 22, 2016 at 0:02 comment added Diana Scott Thank. Yes, I know Theorem 1.7.5. But, in general given two resolutions is a not trivial processes to describe explicitly the chain map. I can describe easily for n=1,2, but just for n=3, the formula is not clear for me. My question is if there is a formula for all n's.
Apr 21, 2016 at 23:33 history answered Chris Gerig CC BY-SA 3.0