intuition.
eapply comp_spec_consequence.
eapply (@oc_comp_spec_eq_until_bad _ _ _ _ _ _ _ _ _ _ _ _ _
(fun z => funcCollision _ _ (fst (split z)))
(fun z => funcCollision _ _ (fst (split z)))
(fun a b => a = b)).
intuition.
eapply F_randomFunc_wf.
intuition.
eapply randomFunc_mem_wf.
wftac.
intuition; subst.
unfold F_randomFunc.
unfold randomFunc_mem.
case_eq ( arrayLookup
(pair_EqDec (list_EqDec (Bvector_EqDec b)) (Bvector_EqDec b)) x2
(a, F x a)); intuition.
case_eq (arrayLookup_f (Bvector_EqDec b) x2 (F x a)); intuition.
eapply comp_spec_ret; intuition.
simpl in *.
remember (split x2) as z.
destruct z.
simpl in *.
trivial.
simpl in *.
remember (split x2) as z.
destruct z.
simpl in *.
erewrite arrayLookup_noCollision_eq in H2; eauto.
inversion H2; clear H2; subst.
trivial.
erewrite arrayLookup_noCollision_eq in H2; eauto.
inversion H2; clear H2; subst.
trivial.
eapply funcCollision_false_impl_collidesWith_false.
unfold funcCollision in *.
simpl in *.
destruct (findCollision_1 (list_EqDec (Bvector_EqDec b))
(Bvector_EqDec b) l a (F x a)).
discriminate.
assert (l = fst (split x2)).
rewrite <- Heqz.
trivial.
subst.
eauto.
eapply arrayLookup_Some_In_split.
eauto.
assert (l = (fst (split x2))).
rewrite <- Heqz.
trivial.
subst.
unfold funcCollision in *.
simpl in *.
unfold collidesWith.
destruct (findCollision_1 (list_EqDec (Bvector_EqDec b))
(Bvector_EqDec b) (fst (split x2)) a (F x a)).
discriminate.
trivial.
simpl in *.
remember (split x2) as z.
destruct z.
simpl in *.
erewrite arrayLookup_noCollision_eq in H2; eauto.
inversion H2; clear H2; subst.
intuition.
unfold funcCollision, collidesWith in *.
simpl in *.
assert (l = fst (split x2)).
rewrite <- Heqz.
trivial.
subst.
destruct (findCollision_1 (list_EqDec (Bvector_EqDec b))
(Bvector_EqDec b) (fst (split x2)) a (F x a)).
discriminate.
trivial.
comp_irr_l.
eapply comp_spec_ret; intuition.
simpl in *.
remember (split x2) as z.
destruct z.
simpl.
trivial.
simpl in *.
remember (split x2) as z.
destruct z.
simpl in *.
erewrite arrayLookup_noCollision_eq in H2; eauto.
discriminate.
assert (l = fst (split x2)).
rewrite <- Heqz.
trivial.
subst.
eapply funcCollision_false_impl_collidesWith_false.
unfold funcCollision in *.
simpl in *.
destruct ( findCollision_1 (list_EqDec (Bvector_EqDec b))
(Bvector_EqDec b) (fst (split x2)) a (F x a)).
discriminate.
eauto.
eapply arrayLookup_Some_In_split.
eauto.
simpl in *.
remember (split x2) as z.
destruct z.
simpl in *.
erewrite arrayLookup_noCollision_eq in H2; eauto.
discriminate.
assert (l = fst (split x2)).
rewrite <- Heqz.
trivial.
subst.
eapply funcCollision_false_impl_collidesWith_false.
unfold funcCollision in *.
simpl in *.
destruct ( findCollision_1 (list_EqDec (Bvector_EqDec b))
(Bvector_EqDec b) (fst (split x2)) a (F x a)).
discriminate.
eauto.
eapply arrayLookup_Some_In_split.
eauto.
case_eq (arrayLookup_f (Bvector_EqDec b) x2 (F x a)); intuition.
comp_irr_r.
eapply comp_spec_ret; intuition.
simpl.
remember (split x2) as z.
destruct z.
simpl.
trivial.
simpl in *.
remember (split x2) as z.
destruct z.
simpl in *.
erewrite arrayLookup_noCollision_eq_f in H; eauto.
discriminate.
unfold funcCollision, collidesWith in *.
simpl in *.
assert (l = (fst (split x2))).
rewrite <- Heqz.
trivial.
subst.
destruct (findCollision_1 (list_EqDec (Bvector_EqDec b))
(Bvector_EqDec b) (fst (split x2)) a (F x a)).
discriminate.
trivial.
simpl in *.
remember (split x2) as z.
destruct z.
simpl in *.
erewrite arrayLookup_noCollision_eq_f in H; eauto.
discriminate.
unfold funcCollision, collidesWith in *.
simpl in *.
assert (l = (fst (split x2))).
rewrite <- Heqz.
trivial.
subst.
destruct (findCollision_1 (list_EqDec (Bvector_EqDec b))
(Bvector_EqDec b) (fst (split x2)) a (F x a)).
discriminate.
trivial.
comp_skip.
apply (oneVector c).
apply (oneVector c).
eapply comp_spec_ret; intuition.
intros.
eapply F_randomFunc_preserves_coll;
eauto.
intuition.
eapply randomFunc_mem_preserves_coll; eauto.
trivial.
trivial.
intuition.
simpl in *; subst.
destruct b1; trivial.
Grab Existential Variables.
trivial.
Qed.

Theorem G2_3_4_bad_eq :
Pr[x <-$ G2_3; ret (snd x)] == Pr[x <-$ G2_4; ret (snd x)].