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Coarsely trivial Borel cross section for $G\to G/N$

No, contrary to what you said, it is not always possible, even if $G$ is a semidirect product. Let us fix some $g \in N$, so $\sigma(gx) = \sigma(x)$ for all $x$. Then $\sigma(x)^{-1} g \sigma(x) = \o …
Dave Witte Morris's user avatar