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Results tagged with cohomology-operations
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user 3969
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When is an ideal in the cohomology ring the kernel of a map induced by a map of spaces?
Let $X$ be a space and $I$ be an ideal in the cohomology ring $H^*(X)$.
I am interested in the question whether there is a map of spaces $Y\rightarrow X$ such that $I$ is the kernel of the induced map …
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