It is well known that $\pi_2(G)$ is trivial for any Lie-group $G$. Is there an elementary proof of this, say, that can be understood with minimal homotopy theory?
Also, who gave the first proof of this theorem?
2026-05-05 17:49:33.1778003373
$\pi_2(G)$ for $G$ a Lie group.
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