Module VSM := VSM.
Proof with simpl in *; auto.
unfold var_eq. intro A. destruct e'... if_tac... rewrite <- H...
Qed.
Proof with simpl in *; auto.
destruct sa... rewrite <- subst_expr_sound...
destruct (val2loc (expr_denote e0 s))... rewrite <- subst_expr_sound...
rewrite <- subst_expr_sound... rewrite <- subst_expr_sound...
Qed.
Proof with simpl; auto.
intro A; revert s A; induction sigma... simpl; intros s A.
apply prop_ext. split; intro B. destruct B as [x [y [B [C D]]]].
exists x; exists y. rewrite (subst_space_atom_sound v e) in C.
split; auto. split; auto. rewrite <- IHsigma; auto.
eapply join_var_eq'; eauto. eapply join_var_eq'; eauto.
destruct B as [x [y [B [C D]]]]. exists x; exists y. split; auto.
rewrite <- subst_space_atom_sound in C; auto. split; auto.
rewrite IHsigma; auto. eapply join_var_eq'; eauto. eapply join_var_eq'; eauto.
Qed.
Proof with destruct delta; try destruct p; try destruct e; simpl; auto.
intros A B; unfold normalize1_3; destruct pc...
simpl in A. destruct sc; auto; intro C; rewrite (@listd_sort_uniq_un _ state);
try solve [apply pure_atom_cmp_eq]. rewrite listd_app, listd_unfold_un.
rewrite (@listd_sort_uniq_inter _ state) in C. 2: apply pure_atom_cmp_eq.
rewrite listd_app, listd_unfold_inter in C; destruct C as [C D].
specialize (A C). specialize (B D). rewrite (@listd_unfold_un _ state) in B.
destruct A as [A | A]; [ destruct B as [B | B]; right | left; auto].
rewrite listd_unfold_un; left... rewrite listd_unfold_un. right.
unfold space_denote in B; unfold subst_spaces.
solve[rewrite <- subst_space_atoms_sound; auto].
rewrite listd_app, listd_unfold_un.
rewrite (@listd_sort_uniq_inter _ state) in C. 2: apply pure_atom_cmp_eq.
rewrite listd_app, listd_unfold_inter in C; destruct C as [C D].
specialize (A C). destruct A as [A | A]; [ | left; auto].
rewrite listd_unfold_inter in D. destruct D as [D E].
unfold subst_spaces in E. rewrite <- subst_space_atoms_sound in E; auto.
simpl in B. rewrite (@listd_unfold_inter _ state) in B. right; apply B.
split; auto.
Qed.
Proof with auto.
generalize (join_ex_identities s); intros [s0 [A [s' B]]].
exists s0; split... assert (s = s'). apply (A _ _ B). subst s...
Qed.

Lemma lseg_nilnil sigma s :
space_denote sigma s =
(space_atom_denote (Lseg Nil Nil) * space_denote sigma)%pred s.