∀ {M : Type u_8} {N : Type u_9} {φ : M → N} {X : Type u_10} {inst : VAdd M X} {Y : Type u_11} {inst_1 : VAdd N Y}
  {toFun : X → Y} {map_vadd' : ∀ (m : M) (x : X), toFun (m +ᵥ x) = φ m +ᵥ toFun x} {toFun_1 : X → Y}
  {map_vadd'_1 : ∀ (m : M) (x : X), toFun_1 (m +ᵥ x) = φ m +ᵥ toFun_1 x},
  { toFun := toFun, map_vadd' := map_vadd' } = { toFun := toFun_1, map_vadd' := map_vadd'_1 } → toFun = toFun_1