Learn Lie algebras 3: Cartan decomposition
Knowing $L$ having nondegenerate bilinear form means to show $l=0$ we show $\langle l,a\rangle=0$ for all $a\in L$.
Calculating the trace trick.
Knowing $L$ having nondegenerate bilinear form means to show $l=0$ we show $\langle l,a\rangle=0$ for all $a\in L$.
Calculating the trace trick.