fact: Definition R_arrow@{i j} {A A' : Type@{i}} (PA : Param00.Rel@{i} A A') {B B' : Type@{j}} (PB : Param00.Rel@{j} B B') := fun f f' => forall a a', PA a a' -> PB (f a) (f' a').
imports: elpi(elpi) Coq(ssreflect) HoTT(HoTT) HoTT_additions Hierarchy Database