Hi, I was reading Cartan's Theorem:(adsbygoogle = window.adsbygoogle || []).push({});

A Group H is a Lie Subgroup to Lie Group G if H is a closed subgroup to G.

Now first of all, is this a definition of Lie Subgroup?

Second, what does it mean that the subgroup is "closed"? I thought all groups where closed under group multiplication.. :/ Help?

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# Lie Subgroup - Cartan's Theorem

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