fact: Definition O_lex_leq_extendable_TypeO (O' O : ReflectiveSubuniverse) `{O << O'} (e : forall (A:Type) (g:A->Type_ O), ExtensionAlong (to O' A) (fun _ => Type_ O) g) : O <<< O'.
imports: HoTT.Basics HoTT.Types HFiber Extensions Limits.Pullback Modality Accessible Localization