English
Brackets respect natural number scaling: [n•x, m] = n [x, m].
Русский
Скобка сохраняет умножение на натуральное число: [n•x, m] = n [x, m].
LaTeX
$$$ [n \\cdot x, m] = n \\cdot [x, m] $$$
Lean4
@[simp]
theorem nsmul_lie (n : ℕ) : ⁅n • x, m⁆ = n • ⁅x, m⁆ :=
AddMonoidHom.map_nsmul { toFun := fun x : L => ⁅x, m⁆, map_zero' := zero_lie m, map_add' := fun _ _ => add_lie _ _ _ }
_ _