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Sep 13, 2022 at 0:57 comment added LSpice Of course, in the spirit of being concrete, we might as well also be concrete about the invariant form; probably the trace form $(X, Y) \mapsto \operatorname{tr}(X Y)$ on $\mathfrak u(n)$ is most natural.
Jun 7, 2016 at 6:20 history answered Qiaochu Yuan CC BY-SA 3.0