∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {J : CategoryTheory.GrothendieckTopology C}
  {R : CategoryTheory.Sheaf J RingCat} [inst_1 : CategoryTheory.HasWeakSheafify J AddCommGrpCat]
  [inst_2 : J.WEqualsLocallyBijective AddCommGrpCat]
  [inst_3 : J.HasSheafCompose (CategoryTheory.forget₂ RingCat AddCommGrpCat)] {I : Type u} (i : I),
  (SheafOfModules.freeCofan I).inj i = SheafOfModules.ιFree i