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Nov 6, 2014 at 0:27 comment added Anton Fetisov A bit offtopic, but do you know any good reference for that $H^4$ fact that doesn't boil down to a direct computation with $K(\mathbb{Z},2)$ and $K(\mathbb{Z}/p^n,2)$? Why is it conceptually so?
Nov 5, 2014 at 22:24 history edited Qiaochu Yuan CC BY-SA 3.0
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Nov 5, 2014 at 22:18 history answered Qiaochu Yuan CC BY-SA 3.0