L:lie algebra


1. L:solvable이면 for any x in [LL], ad_L x : nilpotent임을 보여라.

cf)L:nilpotent이면 for any x in L, ad_L x : nilpotent


2. x:semisimple in End(V)이면 adx:semisimple임을 보여라.


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