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Lie Groups are Groups that are additionally smooth manifolds such that the multiplication and the inverse maps are smooth.

2 votes

How do I stop worrying about root systems and decomposition theorems (for reductive groups)?

I don't really understand what you are asking for. Root systems are geometric objects associated to finite reflection groups. Try reading Jim Humphrey's "Reflection Groups and Coxeter Groups" for a ve …
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Killing form vs its counterpart in a given represenation

These two forms are proportional provided $\mathfrak{g}$ is simple. For the semi-simple case, you can rescale on each of the simple factors.
David Hill's user avatar
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