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In the Idea-section the line
Ordinary cohomology denotes cohomology groups with coefficients in $\mathbb{Z}$
is misleading, making it sound like cohomology with coefficients in, say $\mathbb{Q}$ would not be “ordinary”.
(The definition that follows is correct, but this lead-in should be reworded somehow.)
Incidentally, this entry might better be named “ordinary cohomology in…”
added pointer to:
regarding my comment in #2:
I have deleted that whole sentence now:
Ordinary cohomology denotes cohomology groups with coefficients in $\mathbb{Z}$ this is usually difficult to compute for most spaces, so they are usually broken up into groups for each prime $p$ with coefficients in $\mathbb{Z}_p$. These can be glued back together via the universal coefficient theorem.
Even after fixing the sentence, it would be out of place here. If anyone feels this sentence needs to survive, please add a corresponding paragraph to ordinary cohomology and take note that the entry fracture theorem exists.
Pointer to implementation of cohomology rings in cubical agda: * Thomas Lamiaux, Axel Ljungström, Anders Mörtberg, _Computing Cohomology Rings in Cubical Agda _ ([arxiv:2212.04182] (https://arxiv.org/abs/2212.04182))
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