Theory Increasing (Isabelle2005: October 2005)

# Theory Increasing

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theory Increasing
imports Constrains Monotonicity
begin

    (*  Title:      ZF/UNITY/Increasing
        ID:         $Id ∈ Increasing.thy,v 1.2 2003/06/02 09:17:52 paulson Exp $
        Author:     Sidi O Ehmety, Cambridge University Computer Laboratory
        Copyright   2001  University of Cambridge

    Increasing's parameters are a state function f, a domain A and an order
    relation r over the domain A.
    *)

    header{*Charpentier's "Increasing" Relation*}

    theory Increasing imports Constrains Monotonicity begin

    constdefs

      increasing :: "[i, i, i=>i] => i" ("increasing[_]'(_, _')")
      "increasing[A](r, f) ==
        {F ∈ program. (∀k ∈ A. F ∈ stable({s ∈ state. <k, f(s)> ∈ r})) &
                    (∀x ∈ state. f(x):A)}"

      Increasing :: "[i, i, i=>i] => i" ("Increasing[_]'(_, _')")
      "Increasing[A](r, f) ==
        {F ∈ program. (∀k ∈ A. F ∈ Stable({s ∈ state. <k, f(s)> ∈ r})) &
                    (∀x ∈ state. f(x):A)}"

    syntax
      IncWrt ::  "[i=>i, i, i] => i" ("(_ IncreasingWrt _ '/ _)" [60, 0, 60] 60)

    translations
      "IncWrt(f,r,A)" => "Increasing[A](r,f)"

    (** increasing **)

    lemma increasing_type: "increasing[A](r, f) <= program"
    by (unfold increasing_def, blast)

    lemma increasing_into_program: "F ∈ increasing[A](r, f) ==> F ∈ program"
    by (unfold increasing_def, blast)

    lemma increasing_imp_stable:
    "[| F ∈ increasing[A](r, f); x ∈ A |] ==>F ∈ stable({s ∈ state. <x, f(s)>:r})"
    by (unfold increasing_def, blast)

    lemma increasingD:
    "F ∈ increasing[A](r,f) ==> F ∈ program & (∃a. a ∈ A) & (∀s ∈ state. f(s):A)"
    apply (unfold increasing_def)
    apply (subgoal_tac "∃x. x ∈ state")
    apply (auto dest: stable_type [THEN subsetD] intro: st0_in_state)
    done

    lemma increasing_constant [simp]:
     "F ∈ increasing[A](r, %s. c) <-> F ∈ program & c ∈ A"
    apply (unfold increasing_def stable_def)
    apply (subgoal_tac "∃x. x ∈ state")
    apply (auto dest: stable_type [THEN subsetD] intro: st0_in_state)
    done

    lemma subset_increasing_comp:
    "[| mono1(A, r, B, s, g); refl(A, r); trans[B](s)  |] ==>
       increasing[A](r, f) <= increasing[B](s, g comp f)"
    apply (unfold increasing_def stable_def part_order_def
           constrains_def mono1_def metacomp_def, clarify, simp)
    apply clarify
    apply (subgoal_tac "xa ∈ state")
    prefer 2 apply (blast dest!: ActsD)
    apply (subgoal_tac "<f (xb), f (xb) >:r")
    prefer 2 apply (force simp add: refl_def)
    apply (rotate_tac 5)
    apply (drule_tac x = "f (xb) " in bspec)
    apply (rotate_tac [2] -1)
    apply (drule_tac [2] x = act in bspec, simp_all)
    apply (drule_tac A = "act``?u" and c = xa in subsetD, blast)
    apply (drule_tac x = "f (xa) " and x1 = "f (xb) " in bspec [THEN bspec])
    apply (rule_tac [3] b = "g (f (xb))" and A = B in trans_onD)
    apply simp_all
    done

    lemma imp_increasing_comp:
         "[| F ∈ increasing[A](r, f); mono1(A, r, B, s, g);
             refl(A, r); trans[B](s) |] ==> F ∈ increasing[B](s, g comp f)"
    by (rule subset_increasing_comp [THEN subsetD], auto)

    lemma strict_increasing:
       "increasing[nat](Le, f) <= increasing[nat](Lt, f)"
    by (unfold increasing_def Lt_def, auto)

    lemma strict_gt_increasing:
       "increasing[nat](Ge, f) <= increasing[nat](Gt, f)"
    apply (unfold increasing_def Gt_def Ge_def, auto)
    apply (erule natE)
    apply (auto simp add: stable_def)
    done

    (** Increasing **)

    lemma increasing_imp_Increasing:
         "F ∈ increasing[A](r, f) ==> F ∈ Increasing[A](r, f)"

    apply (unfold increasing_def Increasing_def)
    apply (auto intro: stable_imp_Stable)
    done

    lemma Increasing_type: "Increasing[A](r, f) <= program"
    by (unfold Increasing_def, auto)

    lemma Increasing_into_program: "F ∈ Increasing[A](r, f) ==> F ∈ program"
    by (unfold Increasing_def, auto)

    lemma Increasing_imp_Stable:
    "[| F ∈ Increasing[A](r, f); a ∈ A |] ==> F ∈ Stable({s ∈ state. <a,f(s)>:r})"
    by (unfold Increasing_def, blast)

    lemma IncreasingD:
    "F ∈ Increasing[A](r, f) ==> F ∈ program & (∃a. a ∈ A) & (∀s ∈ state. f(s):A)"
    apply (unfold Increasing_def)
    apply (subgoal_tac "∃x. x ∈ state")
    apply (auto intro: st0_in_state)
    done

    lemma Increasing_constant [simp]:
         "F ∈ Increasing[A](r, %s. c) <-> F ∈ program & (c ∈ A)"
    apply (subgoal_tac "∃x. x ∈ state")
    apply (auto dest!: IncreasingD intro: st0_in_state increasing_imp_Increasing)
    done

    lemma subset_Increasing_comp:
    "[| mono1(A, r, B, s, g); refl(A, r); trans[B](s) |] ==>
       Increasing[A](r, f) <= Increasing[B](s, g comp f)"
    apply (unfold Increasing_def Stable_def Constrains_def part_order_def
           constrains_def mono1_def metacomp_def, safe)
    apply (simp_all add: ActsD)
    apply (subgoal_tac "xb ∈ state & xa ∈ state")
     prefer 2 apply (simp add: ActsD)
    apply (subgoal_tac "<f (xb), f (xb) >:r")
    prefer 2 apply (force simp add: refl_def)
    apply (rotate_tac 5)
    apply (drule_tac x = "f (xb) " in bspec)
    apply simp_all
    apply clarify
    apply (rotate_tac -2)
    apply (drule_tac x = act in bspec)
    apply (drule_tac [2] A = "act``?u" and c = xa in subsetD, simp_all, blast)
    apply (drule_tac x = "f (xa) " and x1 = "f (xb) " in bspec [THEN bspec])
    apply (rule_tac [3] b = "g (f (xb))" and A = B in trans_onD)
    apply simp_all
    done

    lemma imp_Increasing_comp:
     "[| F ∈ Increasing[A](r, f); mono1(A, r, B, s, g); refl(A, r); trans[B](s) |]
      ==> F ∈ Increasing[B](s, g comp f)"
    apply (rule subset_Increasing_comp [THEN subsetD], auto)
    done

    lemma strict_Increasing: "Increasing[nat](Le, f) <= Increasing[nat](Lt, f)"
    by (unfold Increasing_def Lt_def, auto)

    lemma strict_gt_Increasing: "Increasing[nat](Ge, f)<= Increasing[nat](Gt, f)"
    apply (unfold Increasing_def Ge_def Gt_def, auto)
    apply (erule natE)
    apply (auto simp add: Stable_def)
    done

    (** Two-place monotone operations **)

    lemma imp_increasing_comp2:
    "[| F ∈ increasing[A](r, f); F ∈ increasing[B](s, g);
        mono2(A, r, B, s, C, t, h); refl(A, r); refl(B, s); trans[C](t) |]
     ==> F ∈ increasing[C](t, %x. h(f(x), g(x)))"
    apply (unfold increasing_def stable_def
           part_order_def constrains_def mono2_def, clarify, simp)
    apply clarify
    apply (rename_tac xa xb)
    apply (subgoal_tac "xb ∈ state & xa ∈ state")
     prefer 2 apply (blast dest!: ActsD)
    apply (subgoal_tac "<f (xb), f (xb) >:r & <g (xb), g (xb) >:s")
    prefer 2 apply (force simp add: refl_def)
    apply (rotate_tac 6)
    apply (drule_tac x = "f (xb) " in bspec)
    apply (rotate_tac [2] 1)
    apply (drule_tac [2] x = "g (xb) " in bspec)
    apply simp_all
    apply (rotate_tac -1)
    apply (drule_tac x = act in bspec)
    apply (rotate_tac [2] -3)
    apply (drule_tac [2] x = act in bspec, simp_all)
    apply (drule_tac A = "act``?u" and c = xa in subsetD)
    apply (drule_tac [2] A = "act``?u" and c = xa in subsetD, blast, blast)
    apply (rotate_tac -4)
    apply (drule_tac x = "f (xa) " and x1 = "f (xb) " in bspec [THEN bspec])
    apply (rotate_tac [3] -1)
    apply (drule_tac [3] x = "g (xa) " and x1 = "g (xb) " in bspec [THEN bspec])
    apply simp_all
    apply (rule_tac b = "h (f (xb), g (xb))" and A = C in trans_onD)
    apply simp_all
    done

    lemma imp_Increasing_comp2:
    "[| F ∈ Increasing[A](r, f); F ∈ Increasing[B](s, g);
      mono2(A, r, B, s, C, t, h); refl(A, r); refl(B, s); trans[C](t) |] ==>
      F ∈ Increasing[C](t, %x. h(f(x), g(x)))"
    apply (unfold Increasing_def stable_def
           part_order_def constrains_def mono2_def Stable_def Constrains_def, safe)
    apply (simp_all add: ActsD)
    apply (subgoal_tac "xa ∈ state & x ∈ state")
    prefer 2 apply (blast dest!: ActsD)
    apply (subgoal_tac "<f (xa), f (xa) >:r & <g (xa), g (xa) >:s")
    prefer 2 apply (force simp add: refl_def)
    apply (rotate_tac 6)
    apply (drule_tac x = "f (xa) " in bspec)
    apply (rotate_tac [2] 1)
    apply (drule_tac [2] x = "g (xa) " in bspec)
    apply simp_all
    apply clarify
    apply (rotate_tac -2)
    apply (drule_tac x = act in bspec)
    apply (rotate_tac [2] -3)
    apply (drule_tac [2] x = act in bspec, simp_all)
    apply (drule_tac A = "act``?u" and c = x in subsetD)
    apply (drule_tac [2] A = "act``?u" and c = x in subsetD, blast, blast)
    apply (rotate_tac -9)
    apply (drule_tac x = "f (x) " and x1 = "f (xa) " in bspec [THEN bspec])
    apply (rotate_tac [3] -1)
    apply (drule_tac [3] x = "g (x) " and x1 = "g (xa) " in bspec [THEN bspec])
    apply simp_all
    apply (rule_tac b = "h (f (xa), g (xa))" and A = C in trans_onD)
    apply simp_all
    done

    end

lemma increasing_type:

      increasing[A](r, f) ⊆ program

lemma increasing_into_program:

      F ∈ increasing[A](r, f) ==> F ∈ program

lemma increasing_imp_stable:

      [| F ∈ increasing[A](r, f); x ∈ A |] ==> F ∈ stable({s ∈ state . ⟨x, f(s)⟩ ∈ r})

lemma increasingD:

      F ∈ increasing[A](r, f) ==> F ∈ program ∧ (∃a. a ∈ A) ∧ (∀s∈state. f(s) ∈ A)

lemma increasing_constant:

      F ∈ increasing[A](r, %s. c) <-> F ∈ program ∧ c ∈ A

lemma subset_increasing_comp:

      [| mono1(A, r, B, s, g); refl(A, r); trans[B](s) |]
      ==> increasing[A](r, f) ⊆ increasing[B](s, g comp f)

lemma imp_increasing_comp:

      [| F ∈ increasing[A](r, f); mono1(A, r, B, s, g); refl(A, r); trans[B](s) |]
      ==> F ∈ increasing[B](s, g comp f)

lemma strict_increasing:

      increasing[nat](Le, f) ⊆ increasing[nat](Lt, f)

lemma strict_gt_increasing:

      increasing[nat](Ge, f) ⊆ increasing[nat](Gt, f)

lemma increasing_imp_Increasing:

      F ∈ increasing[A](r, f) ==> F ∈ Increasing[A](r, f)

lemma Increasing_type:

      Increasing[A](r, f) ⊆ program

lemma Increasing_into_program:

      F ∈ Increasing[A](r, f) ==> F ∈ program

lemma Increasing_imp_Stable:

      [| F ∈ Increasing[A](r, f); a ∈ A |] ==> F ∈ Stable({s ∈ state . ⟨a, f(s)⟩ ∈ r})

lemma IncreasingD:

      F ∈ Increasing[A](r, f) ==> F ∈ program ∧ (∃a. a ∈ A) ∧ (∀s∈state. f(s) ∈ A)

lemma Increasing_constant:

      F ∈ Increasing[A](r, %s. c) <-> F ∈ program ∧ c ∈ A

lemma subset_Increasing_comp:

      [| mono1(A, r, B, s, g); refl(A, r); trans[B](s) |]
      ==> Increasing[A](r, f) ⊆ Increasing[B](s, g comp f)

lemma imp_Increasing_comp:

      [| F ∈ Increasing[A](r, f); mono1(A, r, B, s, g); refl(A, r); trans[B](s) |]
      ==> F ∈ Increasing[B](s, g comp f)

lemma strict_Increasing:

      Increasing[nat](Le, f) ⊆ Increasing[nat](Lt, f)

lemma strict_gt_Increasing:

      Increasing[nat](Ge, f) ⊆ Increasing[nat](Gt, f)

lemma imp_increasing_comp2:

      [| F ∈ increasing[A](r, f); F ∈ increasing[B](s, g); mono2(A, r, B, s, C, t, h);
         refl(A, r); refl(B, s); trans[C](t) |]
      ==> F ∈ increasing[C](t, %x. h(f(x), g(x)))

lemma imp_Increasing_comp2:

      [| F ∈ Increasing[A](r, f); F ∈ Increasing[B](s, g); mono2(A, r, B, s, C, t, h);
         refl(A, r); refl(B, s); trans[C](t) |]
      ==> F ∈ Increasing[C](t, %x. h(f(x), g(x)))