∀ (R : Type u_4) [inst : Semiring R] (M : Type u_1) [inst_1 : AddCommMonoid M] [inst_2 : Module R M] (N : Type u_3)
  [inst_3 : AddCommMonoid N] [inst_4 : Module R N] {ι : Type u_2} [inst_5 : Subsingleton ι] (i : ι) (x : M [⋀^ι]→ₗ[R] N)
  (x_1 : ι → M) (x_2 x_3 : ι),
  x_1 x_2 = x_1 x_3 →
    ¬x_2 = x_3 →
      ((MultilinearMap.ofSubsingleton R M N i) ((MultilinearMap.ofSubsingleton R M N i).symm ↑x)).toFun x_1 = 0