fact: Definition O_inverts_from_extendable {A : Type@{i}} {B : Type@{j}} (f : A -> B) (e : forall (Z:Type@{k}), In O Z -> ExtendableAlong@{i j k l} 2 f (fun _ => Z)) : O_inverts f.
imports: HoTT.Basics HoTT.Types Equiv.BiInv Extensions HProp HFiber NullHomotopy Limits.Pullback PathAny Colimits.Pushout