Module KnotLemmas_CovariantHeredProp (K: KNOT__COVARIANT_HERED_PROP).
Arguments unsquash_inj [k1 k2] _.
Arguments unsquash_approx [k n Fp] _.

Lemma pred_ext : forall (p1 p2: pred knot),
(forall x, p1 x = p2 x) ->
p1 = p2.