Wikipedia:
Cartan's theorem
In mathematics, there are two basic results in Lie group theory that go by the name Cartan's theorem. They are both named for Élie Cartan.
- 1. The theorem that for a Lie group G, any closed subgroup is a Lie subgroup.
- 2. A theorem on highest weight vectors in the representation theory of a semisimple Lie group.
See also Cartan's theorems A and B, results of Henri Cartan.
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