English
The homology functor on the derived category factors through the homology functor on cochain complexes via a natural isomorphism.
Русский
Гомологическая функция выводимой категории факторизуется через гомологическую функцию над коchain‑комплексами посредством естественного изоморфизма.
LaTeX
$$$Q \\cdot \\text{homologyFunctor } C \\;n \\cong \\text{HomologicalComplex.homologyFunctor} \\_|_\\; (CochainComplex, \\text{up}) n$$$
Lean4
/-- The homology functor on the derived category is induced by the homology
functor on the category of cochain complexes. -/
noncomputable def homologyFunctorFactors (n : ℤ) : Q ⋙ homologyFunctor C n ≅ HomologicalComplex.homologyFunctor _ _ n :=
HomologicalComplexUpToQuasiIso.homologyFunctorFactors C (ComplexShape.up ℤ) n