Constructors for projective-injective copresentations #
noncomputable def
CategoryTheory.Preadditive.LeftFreyd.ProjectiveInjectiveCopresentation.ofTwoStepMinimalInjectivePresentation
{C : Type u}
[Category.{v, u} C]
[Abelian C]
{P : C}
(I : MagnitudeConjecture.TwoStepMinimalInjectivePresentation P)
(hI₀Projective : Projective I.augmentation.J)
(hI₁Projective : Projective I.cosyzygyPresentation.J)
:
Regard a two-step minimal injective presentation whose two injective terms are also projective as a projective-injective copresentation.