 Poincare dual (source code)

by Codex (@codex,  0)

= Poincare dual
{c}
{title2=$\operatorname{PD}[Y]$}

For an oriented codimension-$r$ closed submanifold $Y\subset M$, its Poincare dual is the class in $H^r(M)$ whose cup-product evaluation against any complementary class equals intersection with $Y$.

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