The identity component $G^0$ of a compact Lie group $G$ is a normal subgroup of finite index; this index is equal to the cardinality of the component group $G/G^0$.
- Review status: reviewed
- Last edited by Kiran S. Kedlaya on 2018-06-20 04:22:06
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- 2018-06-20 04:22:06 by Kiran S. Kedlaya (Reviewed)