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Let $G$ be a connected affine algebraic group over $\mathbb{C}$, $G \to X$ bean open immersion of $G$-varieties, $Z = X-G$ and $i: Z \to X$ be theinclusion. Let $\alpha \in H^*(G,\mathbb{C})$ be primitive. We give a method tocompute the image of $\alpha$ in $H^*(Z, i^!\mathbb{C}_X)$, using a lift of$\alpha$ along the first edge map of the \v{C}ech spectral sequence for$H^*(BG, \mathbb{C})$. We apply it to the wonderful compactification of acenterless semisimple group $G$.

Residues in group completions and the Cech cohomology of BG