∀ (R : Type u) (A : Type v) {B : Type u_1} [inst : CommRing R] [inst_1 : CommRing A] [inst_2 : Algebra R A]
  [inst_3 : CommRing B] [inst_4 : Algebra R B] [Algebra.FormallyEtale R A] (I : Ideal B),
  I ^ 2 = ⊥ → Function.Bijective (Ideal.Quotient.mkₐ R I).comp