∀ {G₀ : Type u_3} {M₀' : Type u_4} {F : Type u_6} [inst : GroupWithZero G₀] [inst_1 : MulZeroOneClass M₀']
  [Nontrivial M₀'] [inst_3 : FunLike F G₀ M₀'] [MonoidWithZeroHomClass F G₀ M₀'] (f : F) {a : G₀}, (f a ≠ 0) = (a ≠ 0)