∀ (A : Type u_3) [inst : Ring A] (M : Type u_1) [inst_1 : AddCommGroup M] [inst_2 : Module A M] {N : Type u_2}
  [inst_3 : AddCommGroup N] [inst_4 : Module A N] {f f' : M →ₗ[A] N},
  (Module.Presentation.tautologicalSolution A M).postcomp f =
      (Module.Presentation.tautologicalSolution A M).postcomp f' →
    f = f'