∀ {R : Type u_1} [inst : CommSemiring R] {M : Submonoid R} {S : Type u_2} [inst_1 : CommSemiring S]
  [inst_2 : Algebra R S] {N : Submonoid S} {x : R},
  x ∈ IsLocalization.localizationLocalizationSubmodule M N ↔ ∃ y z, (algebraMap R S) x = ↑y * (algebraMap R S) ↑z