Module KO:=KO'.
Definition knot: Type := KO.K0.knot.
Definition ageable_knot : ageable knot := KO.K0.ageable_knot.
Existing Instance ageable_knot.
Definition predicate: Type := KO.predicate.
Definition squash : (nat * KI.F predicate) -> knot :=
fun k => KO.K0.squash
(fst k, fmap KI.F (bij_f _ _ KO.pkp) (bij_g _ _ KO.pkp) (snd k)).
Definition unsquash : knot -> (nat * KI.F predicate) :=
fun k => let (n, f) := KO.K0.unsquash k in
(n, fmap KI.F (bij_g _ _ KO.pkp) (bij_f _ _ KO.pkp) f).
Definition approx : nat -> predicate -> predicate :=
fun n => (bij_g _ _ KO.pkp) oo KO.K0.approx n oo (bij_f _ _ KO.pkp).
Definition knot_rel (k1 k2:knot) :=
let (n,f) := unsquash k1 in
let (n',f') := unsquash k2 in
n = n' /\ KI.Rel predicate f f'.

Lemma knot_rel_spec: forall k1 k2: knot,
knot_rel k1 k2 = KO.K0.knot_rel k1 k2.