English
There is a zero derivation on the module: D = 0 acts as the additive identity and maps everything linearly to zero with Leibniz rule trivialized.
Русский
Существует нулевая производная, которая acts как нуль-отображение и удовлетворяет тривиальному правилу Лейбница.
LaTeX
$$Zero (Derivation R A M) exists with D(a) = 0 for all a and D(1)=0, Leibniz' trivialized.$$
Lean4
instance : Zero (Derivation R A M) :=
⟨{ toLinearMap := 0
map_one_eq_zero' := rfl
leibniz' := fun a b => by simp only [add_zero, LinearMap.zero_apply, smul_zero] }⟩