∀ {R : Type u_3} {M : Type u_4} {N : Type u_5} [inst : CommSemiring R] [inst_1 : AddCommMonoid M] [inst_2 : Module R M]
  [inst_3 : AddCommMonoid N] [inst_4 : Module R N] {Q Q' : QuadraticMap R M N}, (∀ (x : M), Q x = Q' x) → Q = Q'