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From iris.algebra Require Export cmra.
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Local Hint Extern 1 (_  _) => etrans; [eassumption|].
Local Hint Extern 1 (_  _) => etrans; [|eassumption].
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Local Hint Extern 10 (_  _) => omega.

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Record uPred (M : ucmraT) : Type := IProp {
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  uPred_holds :> nat  M  Prop;
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  uPred_mono n x1 x2 : uPred_holds n x1  x1 {n} x2  uPred_holds n x2;
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  uPred_closed n1 n2 x : uPred_holds n1 x  n2  n1  {n2} x  uPred_holds n2 x
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}.
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Arguments uPred_holds {_} _ _ _ : simpl never.
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Add Printing Constructor uPred.
Instance: Params (@uPred_holds) 3.
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Delimit Scope uPred_scope with I.
Bind Scope uPred_scope with uPred.
Arguments uPred_holds {_} _%I _ _.

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Section cofe.
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  Context {M : ucmraT}.
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  Inductive uPred_equiv' (P Q : uPred M) : Prop :=
    { uPred_in_equiv :  n x, {n} x  P n x  Q n x }.
  Instance uPred_equiv : Equiv (uPred M) := uPred_equiv'.
  Inductive uPred_dist' (n : nat) (P Q : uPred M) : Prop :=
    { uPred_in_dist :  n' x, n'  n  {n'} x  P n' x  Q n' x }.
  Instance uPred_dist : Dist (uPred M) := uPred_dist'.
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  Program Instance uPred_compl : Compl (uPred M) := λ c,
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    {| uPred_holds n x := c n n x |}.
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  Next Obligation. naive_solver eauto using uPred_mono. Qed.
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  Next Obligation.
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    intros c n1 n2 x ???; simpl in *.
    apply (chain_cauchy c n2 n1); eauto using uPred_closed.
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  Qed.
  Definition uPred_cofe_mixin : CofeMixin (uPred M).
  Proof.
    split.
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    - intros P Q; split.
      + by intros HPQ n; split=> i x ??; apply HPQ.
      + intros HPQ; split=> n x ?; apply HPQ with n; auto.
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    - intros n; split.
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      + by intros P; split=> x i.
      + by intros P Q HPQ; split=> x i ??; symmetry; apply HPQ.
      + intros P Q Q' HP HQ; split=> i x ??.
        by trans (Q i x);[apply HP|apply HQ].
    - intros n P Q HPQ; split=> i x ??; apply HPQ; auto.
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    - intros n c; split=>i x ??; symmetry; apply (chain_cauchy c i n); auto.
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  Qed.
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  Canonical Structure uPredC : cofeT := CofeT (uPred M) uPred_cofe_mixin.
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End cofe.
Arguments uPredC : clear implicits.

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Instance uPred_ne' {M} (P : uPred M) n : Proper (dist n ==> iff) (P n).
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Proof.
  intros x1 x2 Hx; split=> ?; eapply uPred_mono; eauto; by rewrite Hx.
Qed.
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Instance uPred_proper {M} (P : uPred M) n : Proper (() ==> iff) (P n).
Proof. by intros x1 x2 Hx; apply uPred_ne', equiv_dist. Qed.

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(** functor *)
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Program Definition uPred_map {M1 M2 : ucmraT} (f : M2 -n> M1)
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  `{!CMRAMonotone f} (P : uPred M1) :
  uPred M2 := {| uPred_holds n x := P n (f x) |}.
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Next Obligation. naive_solver eauto using uPred_mono, includedN_preserving. Qed.
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Next Obligation. naive_solver eauto using uPred_closed, validN_preserving. Qed.

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Instance uPred_map_ne {M1 M2 : ucmraT} (f : M2 -n> M1)
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  `{!CMRAMonotone f} n : Proper (dist n ==> dist n) (uPred_map f).
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Proof.
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  intros x1 x2 Hx; split=> n' y ??.
  split; apply Hx; auto using validN_preserving.
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Qed.
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Lemma uPred_map_id {M : ucmraT} (P : uPred M): uPred_map cid P  P.
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Proof. by split=> n x ?. Qed.
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Lemma uPred_map_compose {M1 M2 M3 : ucmraT} (f : M1 -n> M2) (g : M2 -n> M3)
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    `{!CMRAMonotone f, !CMRAMonotone g} (P : uPred M3):
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  uPred_map (g  f) P  uPred_map f (uPred_map g P).
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Proof. by split=> n x Hx. Qed.
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Lemma uPred_map_ext {M1 M2 : ucmraT} (f g : M1 -n> M2)
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      `{!CMRAMonotone f} `{!CMRAMonotone g}:
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  ( x, f x  g x)   x, uPred_map f x  uPred_map g x.
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Proof. intros Hf P; split=> n x Hx /=; by rewrite /uPred_holds /= Hf. Qed.
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Definition uPredC_map {M1 M2 : ucmraT} (f : M2 -n> M1) `{!CMRAMonotone f} :
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  uPredC M1 -n> uPredC M2 := CofeMor (uPred_map f : uPredC M1  uPredC M2).
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Lemma uPredC_map_ne {M1 M2 : ucmraT} (f g : M2 -n> M1)
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    `{!CMRAMonotone f, !CMRAMonotone g} n :
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  f {n} g  uPredC_map f {n} uPredC_map g.
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Proof.
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  by intros Hfg P; split=> n' y ??;
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    rewrite /uPred_holds /= (dist_le _ _ _ _(Hfg y)); last lia.
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Qed.
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Program Definition uPredCF (F : urFunctor) : cFunctor := {|
  cFunctor_car A B := uPredC (urFunctor_car F B A);
  cFunctor_map A1 A2 B1 B2 fg := uPredC_map (urFunctor_map F (fg.2, fg.1))
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|}.
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Next Obligation.
  intros F A1 A2 B1 B2 n P Q HPQ.
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  apply uPredC_map_ne, urFunctor_ne; split; by apply HPQ.
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Qed.
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Next Obligation.
  intros F A B P; simpl. rewrite -{2}(uPred_map_id P).
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  apply uPred_map_ext=>y. by rewrite urFunctor_id.
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Qed.
Next Obligation.
  intros F A1 A2 A3 B1 B2 B3 f g f' g' P; simpl. rewrite -uPred_map_compose.
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  apply uPred_map_ext=>y; apply urFunctor_compose.
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Qed.

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Instance uPredCF_contractive F :
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  urFunctorContractive F  cFunctorContractive (uPredCF F).
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Proof.
  intros ? A1 A2 B1 B2 n P Q HPQ.
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  apply uPredC_map_ne, urFunctor_contractive=> i ?; split; by apply HPQ.
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Qed.

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(** logical entailement *)
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Inductive uPred_entails {M} (P Q : uPred M) : Prop :=
  { uPred_in_entails :  n x, {n} x  P n x  Q n x }.
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Hint Extern 0 (uPred_entails _ _) => reflexivity.
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Instance uPred_entails_rewrite_relation M : RewriteRelation (@uPred_entails M).
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Hint Resolve uPred_mono uPred_closed : uPred_def.
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(** logical connectives *)
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Program Definition uPred_pure_def {M} (φ : Prop) : uPred M :=
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  {| uPred_holds n x := φ |}.
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Solve Obligations with done.
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Definition uPred_pure_aux : { x | x = @uPred_pure_def }. by eexists. Qed.
Definition uPred_pure {M} := proj1_sig uPred_pure_aux M.
Definition uPred_pure_eq :
  @uPred_pure = @uPred_pure_def := proj2_sig uPred_pure_aux.
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Instance uPred_inhabited M : Inhabited (uPred M) := populate (uPred_pure True).
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Program Definition uPred_and_def {M} (P Q : uPred M) : uPred M :=
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  {| uPred_holds n x := P n x  Q n x |}.
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Solve Obligations with naive_solver eauto 2 with uPred_def.
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Definition uPred_and_aux : { x | x = @uPred_and_def }. by eexists. Qed.
Definition uPred_and {M} := proj1_sig uPred_and_aux M.
Definition uPred_and_eq: @uPred_and = @uPred_and_def := proj2_sig uPred_and_aux.

Program Definition uPred_or_def {M} (P Q : uPred M) : uPred M :=
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  {| uPred_holds n x := P n x  Q n x |}.
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Solve Obligations with naive_solver eauto 2 with uPred_def.
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Definition uPred_or_aux : { x | x = @uPred_or_def }. by eexists. Qed.
Definition uPred_or {M} := proj1_sig uPred_or_aux M.
Definition uPred_or_eq: @uPred_or = @uPred_or_def := proj2_sig uPred_or_aux.

Program Definition uPred_impl_def {M} (P Q : uPred M) : uPred M :=
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  {| uPred_holds n x :=  n' x',
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       x  x'  n'  n  {n'} x'  P n' x'  Q n' x' |}.
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Next Obligation.
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  intros M P Q n1 x1 x1' HPQ [x2 Hx1'] n2 x3 [x4 Hx3] ?; simpl in *.
  rewrite Hx3 (dist_le _ _ _ _ Hx1'); auto. intros ??.
  eapply HPQ; auto. exists (x2  x4); by rewrite assoc.
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Qed.
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Next Obligation. intros M P Q [|n1] [|n2] x; auto with lia. Qed.
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Definition uPred_impl_aux : { x | x = @uPred_impl_def }. by eexists. Qed.
Definition uPred_impl {M} := proj1_sig uPred_impl_aux M.
Definition uPred_impl_eq :
  @uPred_impl = @uPred_impl_def := proj2_sig uPred_impl_aux.
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Program Definition uPred_forall_def {M A} (Ψ : A  uPred M) : uPred M :=
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  {| uPred_holds n x :=  a, Ψ a n x |}.
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Solve Obligations with naive_solver eauto 2 with uPred_def.
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Definition uPred_forall_aux : { x | x = @uPred_forall_def }. by eexists. Qed.
Definition uPred_forall {M A} := proj1_sig uPred_forall_aux M A.
Definition uPred_forall_eq :
  @uPred_forall = @uPred_forall_def := proj2_sig uPred_forall_aux.

Program Definition uPred_exist_def {M A} (Ψ : A  uPred M) : uPred M :=
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  {| uPred_holds n x :=  a, Ψ a n x |}.
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Solve Obligations with naive_solver eauto 2 with uPred_def.
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Definition uPred_exist_aux : { x | x = @uPred_exist_def }. by eexists. Qed.
Definition uPred_exist {M A} := proj1_sig uPred_exist_aux M A.
Definition uPred_exist_eq: @uPred_exist = @uPred_exist_def := proj2_sig uPred_exist_aux.
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Program Definition uPred_eq_def {M} {A : cofeT} (a1 a2 : A) : uPred M :=
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  {| uPred_holds n x := a1 {n} a2 |}.
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Solve Obligations with naive_solver eauto 2 using (dist_le (A:=A)).
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Definition uPred_eq_aux : { x | x = @uPred_eq_def }. by eexists. Qed.
Definition uPred_eq {M A} := proj1_sig uPred_eq_aux M A.
Definition uPred_eq_eq: @uPred_eq = @uPred_eq_def := proj2_sig uPred_eq_aux.
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Program Definition uPred_sep_def {M} (P Q : uPred M) : uPred M :=
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  {| uPred_holds n x :=  x1 x2, x {n} x1  x2  P n x1  Q n x2 |}.
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Next Obligation.
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  intros M P Q n x y (x1&x2&Hx&?&?) [z Hy].
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  exists x1, (x2  z); split_and?; eauto using uPred_mono, cmra_includedN_l.
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  by rewrite Hy Hx assoc.
Qed.
Next Obligation.
  intros M P Q n1 n2 x (x1&x2&Hx&?&?) ?; rewrite {1}(dist_le _ _ _ _ Hx) // =>?.
  exists x1, x2; cofe_subst; split_and!;
    eauto using dist_le, uPred_closed, cmra_validN_op_l, cmra_validN_op_r.
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Qed.
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Definition uPred_sep_aux : { x | x = @uPred_sep_def }. by eexists. Qed.
Definition uPred_sep {M} := proj1_sig uPred_sep_aux M.
Definition uPred_sep_eq: @uPred_sep = @uPred_sep_def := proj2_sig uPred_sep_aux.
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Program Definition uPred_wand_def {M} (P Q : uPred M) : uPred M :=
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  {| uPred_holds n x :=  n' x',
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       n'  n  {n'} (x  x')  P n' x'  Q n' (x  x') |}.
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Next Obligation.
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  intros M P Q n x1 x1' HPQ ? n3 x3 ???; simpl in *.
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  apply uPred_mono with (x1  x3);
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    eauto using cmra_validN_includedN, cmra_preservingN_r, cmra_includedN_le.
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Qed.
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Next Obligation. naive_solver. Qed.
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Definition uPred_wand_aux : { x | x = @uPred_wand_def }. by eexists. Qed.
Definition uPred_wand {M} := proj1_sig uPred_wand_aux M.
Definition uPred_wand_eq :
  @uPred_wand = @uPred_wand_def := proj2_sig uPred_wand_aux.
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Program Definition uPred_always_def {M} (P : uPred M) : uPred M :=
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  {| uPred_holds n x := P n (core x) |}.
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Next Obligation.
  intros M; naive_solver eauto using uPred_mono, @cmra_core_preservingN.
Qed.
Next Obligation. naive_solver eauto using uPred_closed, @cmra_core_validN. Qed.
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Definition uPred_always_aux : { x | x = @uPred_always_def }. by eexists. Qed.
Definition uPred_always {M} := proj1_sig uPred_always_aux M.
Definition uPred_always_eq :
  @uPred_always = @uPred_always_def := proj2_sig uPred_always_aux.

Program Definition uPred_later_def {M} (P : uPred M) : uPred M :=
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  {| uPred_holds n x := match n return _ with 0 => True | S n' => P n' x end |}.
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Next Obligation.
  intros M P [|n] x1 x2; eauto using uPred_mono, cmra_includedN_S.
Qed.
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Next Obligation.
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  intros M P [|n1] [|n2] x; eauto using uPred_closed, cmra_validN_S with lia.
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Qed.
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Definition uPred_later_aux : { x | x = @uPred_later_def }. by eexists. Qed.
Definition uPred_later {M} := proj1_sig uPred_later_aux M.
Definition uPred_later_eq :
  @uPred_later = @uPred_later_def := proj2_sig uPred_later_aux.
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Program Definition uPred_ownM_def {M : ucmraT} (a : M) : uPred M :=
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  {| uPred_holds n x := a {n} x |}.
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Next Obligation.
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  intros M a n x1 x [a' Hx1] [x2 ->].
  exists (a'  x2). by rewrite (assoc op) Hx1.
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Qed.
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Next Obligation. naive_solver eauto using cmra_includedN_le. Qed.
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Definition uPred_ownM_aux : { x | x = @uPred_ownM_def }. by eexists. Qed.
Definition uPred_ownM {M} := proj1_sig uPred_ownM_aux M.
Definition uPred_ownM_eq :
  @uPred_ownM = @uPred_ownM_def := proj2_sig uPred_ownM_aux.

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Program Definition uPred_valid_def {M : ucmraT} {A : cmraT} (a : A) : uPred M :=
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  {| uPred_holds n x := {n} a |}.
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Solve Obligations with naive_solver eauto 2 using cmra_validN_le.
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Definition uPred_valid_aux : { x | x = @uPred_valid_def }. by eexists. Qed.
Definition uPred_valid {M A} := proj1_sig uPred_valid_aux M A.
Definition uPred_valid_eq :
  @uPred_valid = @uPred_valid_def := proj2_sig uPred_valid_aux.
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Notation "P ⊢ Q" := (uPred_entails P%I Q%I)
  (at level 99, Q at level 200, right associativity) : C_scope.
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Notation "(⊢)" := uPred_entails (only parsing) : C_scope.
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Notation "P ⊣⊢ Q" := (equiv (A:=uPred _) P%I Q%I)
  (at level 95, no associativity) : C_scope.
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Notation "(⊣⊢)" := (equiv (A:=uPred _)) (only parsing) : C_scope.
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Notation "■ φ" := (uPred_pure φ%C%type)
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  (at level 20, right associativity) : uPred_scope.
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Notation "x = y" := (uPred_pure (x%C%type = y%C%type)) : uPred_scope.
Notation "x ⊥ y" := (uPred_pure (x%C%type  y%C%type)) : uPred_scope.
Notation "'False'" := (uPred_pure False) : uPred_scope.
Notation "'True'" := (uPred_pure True) : uPred_scope.
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Infix "∧" := uPred_and : uPred_scope.
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Notation "(∧)" := uPred_and (only parsing) : uPred_scope.
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Infix "∨" := uPred_or : uPred_scope.
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Notation "(∨)" := uPred_or (only parsing) : uPred_scope.
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Infix "→" := uPred_impl : uPred_scope.
Infix "★" := uPred_sep (at level 80, right associativity) : uPred_scope.
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Notation "(★)" := uPred_sep (only parsing) : uPred_scope.
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Notation "P -★ Q" := (uPred_wand P Q)
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  (at level 99, Q at level 200, right associativity) : uPred_scope.
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Notation "∀ x .. y , P" :=
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  (uPred_forall (λ x, .. (uPred_forall (λ y, P)) ..)%I) : uPred_scope.
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Notation "∃ x .. y , P" :=
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  (uPred_exist (λ x, .. (uPred_exist (λ y, P)) ..)%I) : uPred_scope.
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Notation "□ P" := (uPred_always P)
  (at level 20, right associativity) : uPred_scope.
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Notation "▷ P" := (uPred_later P)
  (at level 20, right associativity) : uPred_scope.
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Infix "≡" := uPred_eq : uPred_scope.
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Notation "✓ x" := (uPred_valid x) (at level 20) : uPred_scope.
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Definition uPred_iff {M} (P Q : uPred M) : uPred M := ((P  Q)  (Q  P))%I.
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Instance: Params (@uPred_iff) 1.
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Infix "↔" := uPred_iff : uPred_scope.

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Definition uPred_always_if {M} (p : bool) (P : uPred M) : uPred M :=
  (if p then  P else P)%I.
Instance: Params (@uPred_always_if) 2.
Arguments uPred_always_if _ !_ _/.
Notation "□? p P" := (uPred_always_if p P)
  (at level 20, p at level 0, P at level 20, format "□? p  P").

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Class TimelessP {M} (P : uPred M) := timelessP :  P  (P   False).
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Arguments timelessP {_} _ {_}.
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Class PersistentP {M} (P : uPred M) := persistentP : P   P.
Arguments persistentP {_} _ {_}.
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Module uPred.
Definition unseal :=
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  (uPred_pure_eq, uPred_and_eq, uPred_or_eq, uPred_impl_eq, uPred_forall_eq,
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  uPred_exist_eq, uPred_eq_eq, uPred_sep_eq, uPred_wand_eq, uPred_always_eq,
  uPred_later_eq, uPred_ownM_eq, uPred_valid_eq).
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Ltac unseal := rewrite !unseal /=.
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Section uPred_logic.
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Context {M : ucmraT}.
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Implicit Types φ : Prop.
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Implicit Types P Q : uPred M.
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Implicit Types A : Type.
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Notation "P ⊢ Q" := (@uPred_entails M P%I Q%I). (* Force implicit argument M *)
Notation "P ⊣⊢ Q" := (equiv (A:=uPred M) P%I Q%I). (* Force implicit argument M *)
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Arguments uPred_holds {_} !_ _ _ /.
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Hint Immediate uPred_in_entails.
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Global Instance: PreOrder (@uPred_entails M).
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Proof.
  split.
  * by intros P; split=> x i.
  * by intros P Q Q' HP HQ; split=> x i ??; apply HQ, HP.
Qed.
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Global Instance: AntiSymm () (@uPred_entails M).
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Proof. intros P Q HPQ HQP; split=> x n; by split; [apply HPQ|apply HQP]. Qed.
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Lemma equiv_spec P Q : (P  Q)  (P  Q)  (Q  P).
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Proof.
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  split; [|by intros [??]; apply (anti_symm ())].
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  intros HPQ; split; split=> x i; apply HPQ.
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Qed.
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Lemma equiv_entails P Q : (P  Q)  (P  Q).
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Proof. apply equiv_spec. Qed.
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Lemma equiv_entails_sym P Q : (Q  P)  (P  Q).
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Proof. apply equiv_spec. Qed.
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Global Instance entails_proper :
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  Proper (() ==> () ==> iff) (() : relation (uPred M)).
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Proof.
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  move => P1 P2 /equiv_spec [HP1 HP2] Q1 Q2 /equiv_spec [HQ1 HQ2]; split; intros.
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  - by trans P1; [|trans Q1].
  - by trans P2; [|trans Q2].
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Qed.
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Lemma entails_equiv_l (P Q R : uPred M) : (P  Q)  (Q  R)  (P  R).
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Proof. by intros ->. Qed.
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Lemma entails_equiv_r (P Q R : uPred M) : (P  Q)  (Q  R)  (P  R).
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Proof. by intros ? <-. Qed.
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(** Non-expansiveness and setoid morphisms *)
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Global Instance pure_proper : Proper (iff ==> ()) (@uPred_pure M).
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Proof. intros φ1 φ2 Hφ. by unseal; split=> -[|n] ?; try apply Hφ. Qed.
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Global Instance and_ne n : Proper (dist n ==> dist n ==> dist n) (@uPred_and M).
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Proof.
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  intros P P' HP Q Q' HQ; unseal; split=> x n' ??.
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  split; (intros [??]; split; [by apply HP|by apply HQ]).
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Qed.
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Global Instance and_proper :
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  Proper (() ==> () ==> ()) (@uPred_and M) := ne_proper_2 _.
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Global Instance or_ne n : Proper (dist n ==> dist n ==> dist n) (@uPred_or M).
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Proof.
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  intros P P' HP Q Q' HQ; split=> x n' ??.
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  unseal; split; (intros [?|?]; [left; by apply HP|right; by apply HQ]).
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Qed.
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Global Instance or_proper :
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  Proper (() ==> () ==> ()) (@uPred_or M) := ne_proper_2 _.
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Global Instance impl_ne n :
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  Proper (dist n ==> dist n ==> dist n) (@uPred_impl M).
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Proof.
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  intros P P' HP Q Q' HQ; split=> x n' ??.
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  unseal; split; intros HPQ x' n'' ????; apply HQ, HPQ, HP; auto.
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Qed.
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Global Instance impl_proper :
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  Proper (() ==> () ==> ()) (@uPred_impl M) := ne_proper_2 _.
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Global Instance sep_ne n : Proper (dist n ==> dist n ==> dist n) (@uPred_sep M).
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Proof.
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  intros P P' HP Q Q' HQ; split=> n' x ??.
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  unseal; split; intros (x1&x2&?&?&?); cofe_subst x;
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    exists x1, x2; split_and!; try (apply HP || apply HQ);
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    eauto using cmra_validN_op_l, cmra_validN_op_r.
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Qed.
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Global Instance sep_proper :
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  Proper (() ==> () ==> ()) (@uPred_sep M) := ne_proper_2 _.
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Global Instance wand_ne n :
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  Proper (dist n ==> dist n ==> dist n) (@uPred_wand M).
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Proof.
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  intros P P' HP Q Q' HQ; split=> n' x ??; unseal; split; intros HPQ x' n'' ???;
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    apply HQ, HPQ, HP; eauto using cmra_validN_op_r.
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Qed.
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Global Instance wand_proper :
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  Proper (() ==> () ==> ()) (@uPred_wand M) := ne_proper_2 _.
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Global Instance eq_ne (A : cofeT) n :
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  Proper (dist n ==> dist n ==> dist n) (@uPred_eq M A).
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Proof.
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  intros x x' Hx y y' Hy; split=> n' z; unseal; split; intros; simpl in *.
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  * by rewrite -(dist_le _ _ _ _ Hx) -?(dist_le _ _ _ _ Hy); auto.
  * by rewrite (dist_le _ _ _ _ Hx) ?(dist_le _ _ _ _ Hy); auto.
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Qed.
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Global Instance eq_proper (A : cofeT) :
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  Proper (() ==> () ==> ()) (@uPred_eq M A) := ne_proper_2 _.
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Global Instance forall_ne A n :
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  Proper (pointwise_relation _ (dist n) ==> dist n) (@uPred_forall M A).
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Proof.
  by intros Ψ1 Ψ2 HΨ; unseal; split=> n' x; split; intros HP a; apply HΨ.
Qed.
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Global Instance forall_proper A :
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  Proper (pointwise_relation _ () ==> ()) (@uPred_forall M A).
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Proof.
  by intros Ψ1 Ψ2 HΨ; unseal; split=> n' x; split; intros HP a; apply HΨ.
Qed.
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Global Instance exist_ne A n :
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  Proper (pointwise_relation _ (dist n) ==> dist n) (@uPred_exist M A).
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Proof.
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  intros Ψ1 Ψ2 HΨ.
  unseal; split=> n' x ??; split; intros [a ?]; exists a; by apply HΨ.
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Qed.
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Global Instance exist_proper A :
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  Proper (pointwise_relation _ () ==> ()) (@uPred_exist M A).
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Proof.
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  intros Ψ1 Ψ2 HΨ.
  unseal; split=> n' x ?; split; intros [a ?]; exists a; by apply HΨ.
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Qed.
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Global Instance later_contractive : Contractive (@uPred_later M).
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Proof.
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  intros n P Q HPQ; unseal; split=> -[|n'] x ??; simpl; [done|].
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  apply (HPQ n'); eauto using cmra_validN_S.
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Qed.
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Global Instance later_proper :
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  Proper (() ==> ()) (@uPred_later M) := ne_proper _.
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Global Instance always_ne n : Proper (dist n ==> dist n) (@uPred_always M).
Proof.
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  intros P1 P2 HP.
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  unseal; split=> n' x; split; apply HP; eauto using @cmra_core_validN.
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Qed.
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Global Instance always_proper :
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  Proper (() ==> ()) (@uPred_always M) := ne_proper _.
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Global Instance ownM_ne n : Proper (dist n ==> dist n) (@uPred_ownM M).
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Proof.
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  intros a b Ha.
  unseal; split=> n' x ? /=. by rewrite (dist_le _ _ _ _ Ha); last lia.
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Qed.
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Global Instance ownM_proper: Proper (() ==> ()) (@uPred_ownM M) := ne_proper _.
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Global Instance valid_ne {A : cmraT} n :
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Proper (dist n ==> dist n) (@uPred_valid M A).
Proof.
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  intros a b Ha; unseal; split=> n' x ? /=.
  by rewrite (dist_le _ _ _ _ Ha); last lia.
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Qed.
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Global Instance valid_proper {A : cmraT} :
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  Proper (() ==> ()) (@uPred_valid M A) := ne_proper _.
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Global Instance iff_ne n : Proper (dist n ==> dist n ==> dist n) (@uPred_iff M).
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Proof. unfold uPred_iff; solve_proper. Qed.
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Global Instance iff_proper :
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  Proper (() ==> () ==> ()) (@uPred_iff M) := ne_proper_2 _.
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(** Introduction and elimination rules *)
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Lemma pure_intro φ P : φ  P   φ.
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Proof. by intros ?; unseal; split. Qed.
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Lemma pure_elim φ Q R : (Q   φ)  (φ  Q  R)  Q  R.
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Proof.
  unseal; intros HQP HQR; split=> n x ??; apply HQR; first eapply HQP; eauto.
Qed.
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Lemma and_elim_l P Q : P  Q  P.
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Proof. by unseal; split=> n x ? [??]. Qed.
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Lemma and_elim_r P Q : P  Q  Q.
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Proof. by unseal; split=> n x ? [??]. Qed.
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Lemma and_intro P Q R : (P  Q)  (P  R)  P  Q  R.
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Proof. intros HQ HR; unseal; split=> n x ??; by split; [apply HQ|apply HR]. Qed.
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Lemma or_intro_l P Q : P  P  Q.
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Proof. unseal; split=> n x ??; left; auto. Qed.
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Lemma or_intro_r P Q : Q  P  Q.
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Proof. unseal; split=> n x ??; right; auto. Qed.
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Lemma or_elim P Q R : (P  R)  (Q  R)  P  Q  R.
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Proof. intros HP HQ; unseal; split=> n x ? [?|?]. by apply HP. by apply HQ. Qed.
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Lemma impl_intro_r P Q R : (P  Q  R)  P  Q  R.
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Proof.
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  unseal; intros HQ; split=> n x ?? n' x' ????. apply HQ;
    naive_solver eauto using uPred_mono, uPred_closed, cmra_included_includedN.
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Qed.
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Lemma impl_elim P Q R : (P  Q  R)  (P  Q)  P  R.
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Proof. by unseal; intros HP HP'; split=> n x ??; apply HP with n x, HP'. Qed.
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Lemma forall_intro {A} P (Ψ : A  uPred M): ( a, P  Ψ a)  P   a, Ψ a.
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Proof. unseal; intros HPΨ; split=> n x ?? a; by apply HPΨ. Qed.
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Lemma forall_elim {A} {Ψ : A  uPred M} a : ( a, Ψ a)  Ψ a.
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Proof. unseal; split=> n x ? HP; apply HP. Qed.
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Lemma exist_intro {A} {Ψ : A  uPred M} a : Ψ a   a, Ψ a.
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Proof. unseal; split=> n x ??; by exists a. Qed.
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Lemma exist_elim {A} (Φ : A  uPred M) Q : ( a, Φ a  Q)  ( a, Φ a)  Q.
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Proof. unseal; intros HΦΨ; split=> n x ? [a ?]; by apply HΦΨ with a. Qed.
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Lemma eq_refl {A : cofeT} (a : A) : True  a  a.
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Proof. unseal; by split=> n x ??; simpl. Qed.
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Lemma eq_rewrite {A : cofeT} a b (Ψ : A  uPred M) P
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  {HΨ :  n, Proper (dist n ==> dist n) Ψ} : (P  a  b)  (P  Ψ a)  P  Ψ b.
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Proof.
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  unseal; intros Hab Ha; split=> n x ??. apply HΨ with n a; auto.
  - by symmetry; apply Hab with x.
  - by apply Ha.
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Qed.
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Lemma eq_equiv {A : cofeT} (a b : A) : (True  a  b)  a  b.
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Proof.
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  unseal=> Hab; apply equiv_dist; intros n; apply Hab with ; last done.
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  apply cmra_valid_validN, ucmra_unit_valid.
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Qed.
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Lemma eq_rewrite_contractive {A : cofeT} a b (Ψ : A  uPred M) P
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  {HΨ : Contractive Ψ} : (P   (a  b))  (P  Ψ a)  P  Ψ b.
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Proof.
  unseal; intros Hab Ha; split=> n x ??. apply HΨ with n a; auto.
  - destruct n; intros m ?; first omega. apply (dist_le n); last omega.
    symmetry. by destruct Hab as [Hab]; eapply (Hab (S n)).
  - by apply Ha.
Qed.
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(* Derived logical stuff *)
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Lemma False_elim P : False  P.
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Proof. by apply (pure_elim False). Qed.
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Lemma True_intro P : P  True.
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Proof. by apply pure_intro. Qed.
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Lemma and_elim_l' P Q R : (P  R)  P  Q  R.
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Proof. by rewrite and_elim_l. Qed.
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Lemma and_elim_r' P Q R : (Q  R)  P  Q  R.
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Proof. by rewrite and_elim_r. Qed.
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Lemma or_intro_l' P Q R : (P  Q)  P  Q  R.
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Proof. intros ->; apply or_intro_l. Qed.
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Lemma or_intro_r' P Q R : (P  R)  P  Q  R.
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Proof. intros ->; apply or_intro_r. Qed.
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Lemma exist_intro' {A} P (Ψ : A  uPred M) a : (P  Ψ a)  P   a, Ψ a.
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Proof. intros ->; apply exist_intro. Qed.
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Lemma forall_elim' {A} P (Ψ : A  uPred M) : (P   a, Ψ a)   a, P  Ψ a.
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Proof. move=> HP a. by rewrite HP forall_elim. Qed.
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Hint Resolve or_elim or_intro_l' or_intro_r'.
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Hint Resolve and_intro and_elim_l' and_elim_r'.
Hint Immediate True_intro False_elim.
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Lemma impl_intro_l P Q R : (Q  P  R)  P  Q  R.
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Proof. intros HR; apply impl_intro_r; rewrite -HR; auto. Qed.
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Lemma impl_elim_l P Q : (P  Q)  P  Q.
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Proof. apply impl_elim with P; auto. Qed.
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Lemma impl_elim_r P Q : P  (P  Q)  Q.
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Proof. apply impl_elim with P; auto. Qed.
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Lemma impl_elim_l' P Q R : (P  Q  R)  P  Q  R.
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Proof. intros; apply impl_elim with Q; auto. Qed.
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Lemma impl_elim_r' P Q R : (Q  P  R)  P  Q  R.
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Proof. intros; apply impl_elim with P; auto. Qed.
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Lemma impl_entails P Q : (True  P  Q)  P  Q.
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Proof. intros HPQ; apply impl_elim with P; rewrite -?HPQ; auto. Qed.
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Lemma entails_impl P Q : (P  Q)  True  P  Q.
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Proof. auto using impl_intro_l. Qed.
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Lemma iff_refl Q P : Q  P  P.
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Proof. rewrite /uPred_iff; apply and_intro; apply impl_intro_l; auto. Qed.
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Lemma iff_equiv P Q : (True  P  Q)  (P