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Sep 14, 2018 at 0:27 comment added Nicholas Kuhn dvitek: the homotopy groups will stabilize when the homology groups do. Regarding your other question: imagine putting in suspensions of X into the X variable, or let X be a spectrum. The key case turns out to be spheres.
Sep 13, 2018 at 17:53 comment added dvitek Maybe I'm missing something, but I'm not sure how helpful this is for my specific question about the homotopy groups of $\mathrm{Sym}^nX$. I agree that the paper of Dold you mention solves the problem for homology (and a later paper of Puppe, MR0216497, solves the problem for cohomology). Your comment about the factorization of the Hurewicz map seems far more useful: what do you mean by the "stable range" of that filtration?
Sep 12, 2018 at 23:20 history edited j.c. CC BY-SA 4.0
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Sep 12, 2018 at 20:13 history answered Nicholas Kuhn CC BY-SA 4.0