李群李代數 === # 群 1. 乘法滿足結合律: (g~1~g~2~)g~3~ = g~1~(g~2~g~3~) 2. $\exists e \in G \ s.t. \ eg=ge=g, \forall g \in G$ 3. $\forall g \in G \ \exists \ g^{-1} \ s.t. \ g^{-1}g=gg^{-1}=e$
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