no goals
C : Type u_2
inst✝¹ : Category C
f : Arrow C
inst✝ : ∀ (n : ℕ), HasWidePullback f.right (fun x => f.left) fun x => f.hom
S : SplitEpi f.hom
n : ℕ
⊢ (s f S n ≫ WidePullback.base fun x => f.hom) = WidePullback.base fun x => f.hom
apply WidePullback.lift_base