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Jul 21, 2019 at 22:14 comment added Connor Malin The “most” is meant to apply both to failing to represent cohomology and failing to be a group in that only a couple actually accomplish either.
Jul 21, 2019 at 21:34 comment added Denis Nardin Well, $S^3$ is a group (yeah, yeah, not a commutative one...)
Jul 21, 2019 at 21:16 history answered Connor Malin CC BY-SA 4.0