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I'm just thinking about the relationship between homology and homotopy groups of a space. I know that homology is basically an abelianization of the fundamental group (please correct me if I'm wrong). If anyone could please say a few words about my question, I would be appreciative. What/where else could I read about addressing such topics?

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    This question actually goes quite deep: one can view the Adams spectral sequence as measuring the failure of the natural map $\pi_*(X) \rightarrow H_*(X)$ to be an isomorphism.2012-05-11

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