English
Higher right-derived functors vanish on injective objects: if X is injective, then R^{n+1}(F)(X) = 0 for all n.
Русский
Высшие правые производные на инъективных объектах равны нулю: если X инъективно, то R^{n+1}(F)(X)=0 для всех n.
LaTeX
$$$\\mathrm{IsZero}\\left((F.rightDerived (n+1)).obj X\\right)$ for injective X$$
Lean4
/-- The higher derived functors vanish on injective objects. -/
theorem isZero_rightDerived_obj_injective_succ (F : C ⥤ D) [F.Additive] (n : ℕ) (X : C) [Injective X] :
IsZero ((F.rightDerived (n + 1)).obj X) :=
by
refine IsZero.of_iso ?_ ((InjectiveResolution.self X).isoRightDerivedObj F (n + 1))
erw [← HomologicalComplex.exactAt_iff_isZero_homology]
exact ShortComplex.exact_of_isZero_X₂ _ (F.map_isZero (by apply isZero_zero))