fact: Definition extendable_functor_sigma (n : nat) {A B} {P : A -> Type} {Q : B -> Type} (f : A -> B) (g : forall a, P a -> Q (f a)) (C : sig Q -> Type) (ef : HomotopyExtendableAlong n f C) (eg : forall a, ExtendableAlong n (g a) (fun v => C (f a ; v))) : ExtendableAlong n (functor_sigma f g) C.
imports: HoTT.Basics HoTT.Types Equiv.PathSplit PathAny Cubical.DPath Cubical.DPathSquare Colimits.Coeq Colimits.MappingCylinder