∀ {C : Type u_1} [inst : CategoryTheory.Category.{u_3, u_1} C] {J : CategoryTheory.GrothendieckTopology C}
  {R : CategoryTheory.Sheaf J RingCat} [inst_1 : CategoryTheory.HasSheafify J AddCommGrpCat]
  [inst_2 : J.WEqualsLocallyBijective AddCommGrpCat]
  [inst_3 : J.HasSheafCompose (CategoryTheory.forget₂ RingCat AddCommGrpCat)] {M : SheafOfModules R}
  (P : M.Presentation),
  CategoryTheory.CategoryStruct.comp
      (CategoryTheory.CategoryStruct.comp
        ((CategoryTheory.Limits.kernel P.generators.π).freeHomEquiv.symm P.relations.s)
        (CategoryTheory.Limits.kernel.ι P.generators.π))
      P.generators.π =
    0