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Results tagged with cohomology-operations
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user 2183
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Pontryagin square of Stiefel-Whitney classes and Pontryagin classes
On a four-manifold, there is apparently a relation between the first Pontryagin class modulo 4 and the Pontryagin square of the second Stiefel-Whitney class:
$\mathfrak{P}(w_2) = p_1 \; {\rm mod} \; …
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