∀ (K : Type u_2) (L : Type u_3) [inst : LieRing L] [inst_1 : Field K] [inst_2 : LieAlgebra K L]
  [inst_3 : FiniteDimensional K L] (H : LieSubalgebra K L) [inst_4 : H.IsCartanSubalgebra]
  [inst_5 : LieAlgebra.IsKilling K L] [LieModule.IsTriangularizable K (↥H) L],
  Submodule.span K (LieModule.Weight.toLinear K (↥H) L '' {α | α.IsNonZero}) = ⊤