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Homotopy theory, homological algebra, algebraic treatments of manifolds.

7 votes
1 answer
326 views

Parity of self-linking

For a class $x$ in $H_{2k}$ of a 4k-manifold $M$, the self-intersection $x.x$ agrees mod 2 with the cap product of $x$ with the Wu class $v_{2k}$. If instead $x$ is a torsion element of $H_{2k}$ of a …
Terry Wall's user avatar