English
As above, the canonical isomorphism between the shifted and mapped bifunctors with signs.
Русский
Как выше, каноническое изоморфизм между сдвинутым и отображаемым бифунктором с знаками.
LaTeX
$$$ mapBifunctorHomologicalComplexShift₂Iso K_1 K_2 F y i \;: \; \text{(explicit iso)} $$$
Lean4
/-- Auxiliary definition for `mapBifunctorShift₂Iso`. -/
@[simps! hom_f_f inv_f_f]
def mapBifunctorHomologicalComplexShift₂Iso :
((F.mapBifunctorHomologicalComplex _ _).obj K₁).obj (K₂⟦y⟧) ≅
(HomologicalComplex₂.shiftFunctor₂ D y).obj (((F.mapBifunctorHomologicalComplex _ _).obj K₁).obj K₂) :=
HomologicalComplex.Hom.isoOfComponents (fun i₁ => HomologicalComplex.Hom.isoOfComponents (fun _ => Iso.refl _))
(by
intros
ext
dsimp
simp only [id_comp, comp_id])