Costalk
= Costalk
{title2=$i_x^!E$}
The derived <costalk> at $x$ is $i_x^!E$, where $i_x:\{x\}\hookrightarrow X$. It computes local <cohomology> supported at $x$. On an oriented $N$-manifold the constant <sheaf> has <costalk> $\mathbb Q[-N]$, whose <cohomology> is in degree $N$.