English
There is an equivalence: L is nilpotent on M if and only if there exists k with the k-th lower central series equal to the zero submodule.
Русский
Существуют эквивалентности: нильпотентность L на M равнозначна существованию k, такого что lcs_k = ⊥.
LaTeX
$$IsNilpotent L M ↔ ∃ k, lowerCentralSeries R L M k = ⊥$$
Lean4
/-- See also `LieModule.isNilpotent_iff_exists_ucs_eq_top`. -/
theorem isNilpotent_iff : IsNilpotent L M ↔ ∃ k, lowerCentralSeries R L M k = ⊥ := by
simp [isNilpotent_iff_int, SetLike.ext'_iff, coe_lowerCentralSeries_eq_int R L M]