| http://www.w3.org/ns/prov#value | - There are only a few Eilenberg-MacLane spaces with simple geometric constructions (the only ones I know are the circle, infinite real and complex projective space, compact surfaces of positive genus, $K(S_n, 1)$ as the spaces in the little cubes operad, and examples such as the one below); this seems to express the fact that cohomology operations are complicated.
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