I have a question about Lie subalgebra.(adsbygoogle = window.adsbygoogle || []).push({});

They say "a Lie subalgebra is a much more CONSTRAINED structure than a subspace".

Well, it seems subtle, and I find this very tricky to follow.

Can anyone explain this with concrete examples?

If my question is not clear, please tell me so, I will try to rephrase it.

Thanks.

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# Lie subalgebra and subspace

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