fact: Definition equiv_plus_pullback {A B C : Type} (f : B -> A) (g : C -> A) : Plus L O (Pullback f g) <~> Pullback (plus_functor L O f) (plus_functor L O g).
imports: HoTT.Basics HoTT.Types Extensions HFiber Truncations NullHomotopy Limits.Pullback Descent Lex Separated