# HG changeset patch
# User paulson
# Date 933953358 -7200
# Node ID 2bc63a44721b2b1631f821bf1fd9c5e3f39f1082
# Parent  676027b1d770f82c53ac729e5d8752775215cbc1
re-organization of theorems from Alloc and PPROD, partly into new theory
Lift_prog

diff -r 676027b1d770 -r 2bc63a44721b src/HOL/UNITY/Alloc.ML
--- a/src/HOL/UNITY/Alloc.ML	Fri Aug 06 17:28:45 1999 +0200
+++ b/src/HOL/UNITY/Alloc.ML	Fri Aug 06 17:29:18 1999 +0200
@@ -20,8 +20,6 @@
 
 
 
-Addsimps [sub_def];
-
 Goalw [sysOfAlloc_def] "inj sysOfAlloc";
 by (rtac injI 1);
 by Auto_tac;
@@ -47,554 +45,6 @@
 
 AddIffs [finite_lessThan];
 
-(*could move to PPROD.ML, but function "sub" is needed there*)
-Goal "lift_set i {s. P s} = {s. P (sub i s)}";
-by (asm_simp_tac (simpset() addsimps [lift_set_def]) 1);
-qed "lift_set_sub";
-
-(*ONE OF THESE IS REDUNDANT!*)
-Goal "lift_set i {s. P s} = {s. P (s i)}";
-by (asm_simp_tac (simpset() addsimps [lift_set_def]) 1);
-qed "lift_set_sub2";
-
-Goalw [Increasing_def]
-     "[| i: I;  finite I |]  \
-\     ==> ((plam x:I. F) : Increasing (f o sub i)) = (F : Increasing f)";
-by (subgoal_tac "ALL z. {s. z <= (f o sub i) s} = lift_set i {s. z <= f s}" 1);
-by (asm_simp_tac (simpset() addsimps [lift_set_sub]) 2);
-by (asm_full_simp_tac (simpset() addsimps [const_PLam_Stable]) 1);
-qed "const_PLam_Increasing";
-
-
-(*The other direction fails: having FF : Stable {s. z <= f (s i)} does not
-  ensure that F has the form lift_prog i F for some F.*)
-Goal "lift_prog i `` Stable {s. P (f s)} <= Stable {s. P (f (s i))}";
-by Auto_tac;
-by (stac (lift_set_sub2 RS sym) 1); 
-by (asm_simp_tac (simpset() addsimps [lift_prog_Stable_eq]) 1);
-qed "image_lift_prog_Stable";
-
-Goal "lift_prog i `` Increasing f <= Increasing (f o sub i)";
-by (simp_tac (simpset() addsimps [Increasing_def,
-				  inj_lift_prog RS image_INT]) 1);
-by (blast_tac (claset() addIs [impOfSubs image_lift_prog_Stable]) 1);
-qed "image_lift_prog_Increasing";
-
-
-(*****************PPROD.ML******************)
-
-(*???????????????*)
-Goal "[| F : (drop_prog i `` X) guar (drop_prog i `` Y);  modular i Y |] \
-\     ==> lift_prog i F : X guar Y";
-by (rtac guaranteesI 1);
-by (dtac guaranteesD 1);
-by (rtac image_eqI 1);
-by (rtac (drop_prog_lift_prog_Join RS sym) 1);
-by (assume_tac 1);
-by Auto_tac;
-by (full_simp_tac (simpset() addsimps [modular_def,
-				       drop_prog_lift_prog_Join RS sym]) 1);
-by (dtac sym 1);
-by (Blast_tac 1);
-qed "drop_prog_guarantees";
-
-Goalw [constrains_def]
-     "(drop_prog i F : A co B)  =  \
-\     (F : (lift_set i A) co (lift_set i B))";
-by Auto_tac;
-by (force_tac (claset(), 
-	       simpset() addsimps [drop_act_def]) 2);
-by (blast_tac (claset() addIs [drop_act_I]) 1);
-qed "drop_prog_constrains_eq";
-
-Goal "(drop_prog i F : stable A)  =  (F : stable (lift_set i A))";
-by (simp_tac (simpset() addsimps [stable_def, drop_prog_constrains_eq]) 1);
-qed "drop_prog_stable_eq";
-
-Goal "modular i (stable {s. P(s i)})";
-by (simp_tac (simpset() addsimps [modular_def, lift_set_sub2 RS sym,
-				  drop_prog_stable_eq RS sym]) 1);
-by Auto_tac;
-qed "modular_stable_i";
-
-
-(** Weak Constrains and Stable **)
-
-Goal "f : reachable F ==> f i : reachable (drop_prog i F)";
-by (etac reachable.induct 1);
-by (force_tac (claset() addIs [reachable.Acts, drop_act_I],
-	       simpset()) 2);
-by (force_tac (claset() addIs [reachable.Init, drop_set_I],
-	       simpset()) 1);
-qed "reachable_imp_reachable_drop_prog";
-
-Goalw [Constrains_def]
-     "drop_prog i F : A Co B ==> F : (lift_set i A) Co (lift_set i B)";
-by (full_simp_tac (simpset() addsimps [drop_prog_constrains_eq]) 1);
-by (etac constrains_weaken_L 1);
-by Auto_tac;
-by (etac reachable_imp_reachable_drop_prog 1);
-qed "drop_prog_Constrains_D";
-
-Goalw [Stable_def]
-     "drop_prog i F : Stable A ==> F : Stable (lift_set i A)";
-by (asm_simp_tac (simpset() addsimps [drop_prog_Constrains_D]) 1);
-qed "drop_prog_Stable_D";
-
-(***?????????????
-Goal "i ~= j ==> lift_prog i `` UNIV <= stable {s. P (f (s j))}";
-by Auto_tac;
-by (stac (lift_set_sub2 RS sym) 1); 
-by (asm_simp_tac (simpset() addsimps [lift_prog_Stable_eq]) 1);
-qed "image_lift_prog_Stable";
-??????????????*)
-
-
-
-(****UNITY.ML?  BUT it's not clear that Idle is good for anything.
-     Could equally want to forbid actions that are subsets of Id 
-   OR can simple constraints on actions prevent this?****)
-Goalw [constrains_def, Idle_def] "F : Idle ==> (F : A co B) = (A<=B)";
-by (Blast_tac 1);
-qed "constrains_Idle_iff";
-
-Goalw [stable_def,constrains_def,Idle_def] "F : Idle ==> F : stable A";
-by (Blast_tac 1);
-qed "stable_Idle";
-
-Goalw [drop_act_def, lift_act_def]
-     "i~=j ==> drop_act i (lift_act j act) <= Id";
-by Auto_tac;
-by (etac subst 1);
-by (Asm_simp_tac 1);
-qed "neq_drop_act_lift_act";
-
-Goal "drop_prog i (JN j:I - {i}. lift_prog j F) : Idle";
-by (simp_tac (simpset() addsimps [Acts_JN,Idle_def]) 1);
-by Auto_tac;
-by (rtac ccontr 1);  
-  (*otherwise PROOF FAILED because tactics don't get negated conclusion*)
-by (blast_tac (claset() addSDs [impOfSubs neq_drop_act_lift_act]) 1);
-qed "drop_prog_JN_other_Idle";
-
-Goal "[| F component G;  G : Idle |] ==> F : Idle";
-by (full_simp_tac (simpset() addsimps [Idle_def, component_eq_subset]) 1);
-by Auto_tac;
-qed "component_Idle";
-
-Goal "G component (JN j: I-{i}. JN H: UNIV. lift_prog j H) \
-\     ==> drop_prog i G : Idle";
-by (dtac drop_prog_mono 1);
-by (etac component_Idle 1);
-by (simp_tac (simpset() addsimps [drop_prog_JN_other_Idle, 
-				  lift_prog_JN RS sym]) 1);
-qed "component_JN_neq_imp_Idle";
-
-Goal "drop_prog i G : Idle ==> G : stable (lift_set i A)";
-by (simp_tac (simpset() addsimps [drop_prog_stable_eq RS sym]) 1);
-by (blast_tac (claset() addIs [stable_Idle]) 1);
-qed "Idle_imp_stable_lift_set";
-
-(*like neq_drop_act_lift_act but stronger premises and conclusion*)
-Goal "[| i~=j;  act ~= {} |] ==> drop_act i (lift_act j act) = Id";
-by (rtac equalityI 1);
-by (etac neq_drop_act_lift_act 1);
-by (asm_simp_tac (simpset() addsimps [drop_act_def, lift_act_def]) 1);
-by Auto_tac;
-ren "s s'" 1;
-by (dres_inst_tac [("x", "f(i:=x,j:=s)")] spec 1);
-by (Asm_full_simp_tac 1);
-by (dres_inst_tac [("x", "f(i:=x,j:=s')")] spec 1);
-by (Asm_full_simp_tac 1);
-by (swap_res_tac [ext] 1);
-by (Asm_simp_tac 1);
-qed "neq_drop_act_lift_act_eq";
-
-
-Goal "act ~= {} ==> drop_act i (lift_act j act) = (if i=j then act else Id)";
-by (asm_simp_tac (simpset() addsimps [neq_drop_act_lift_act_eq]) 1);
-qed "drop_act_lift_act_eq";
-
-
-(*first premise says that the system has an initial state*)
-Goalw [PLam_def]
-     "[| ALL j:I. f0 j : Init (F j);   \
-\        ALL j:I. {}  ~: Acts (F j);   i: I |] \
-\     ==> drop_prog i (plam j:I. F j) = F i";
-by (simp_tac (simpset() addsimps [Acts_JN, lift_prog_def, drop_prog_def]) 1);
-by (rtac program_equalityI 1);
-by (asm_simp_tac (simpset() addsimps [drop_set_INT_lift_set]) 1);
-by (Asm_simp_tac 1);
-by (subgoal_tac
-    "drop_act i `` (UN i:I. lift_act i `` Acts (F i)) = Acts (F i)" 1);
-by (Asm_simp_tac 1);
-by Auto_tac;
-ren "act" 1;
-by (subgoal_tac "act ~= {}" 1);
-by (Blast_tac 2);
-by (asm_simp_tac (simpset() addsimps [drop_act_lift_act_eq]) 1);
-by (rtac image_eqI 1);
-by (rtac (lift_act_inverse RS sym) 1);
-by Auto_tac;
-qed "drop_prog_plam_eq";
-
-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx;
-
-(**STILL trying to lift the guarantees propery from one client to a family.
-   first with a "localTo" precondition.  Then to look at the void (UNIV) 
-   precondition.**)
-
-(*CANNOT be proved because the premise tells us NOTHING AT ALL about
-  actions outside i [rather than telling us there aren't any]
-  MAY UNIVERSALLY QUANTIFY both premise and conclusion???**)
-Goal "F : stable (lift_set i A) ==> x = lift_prog i (drop_prog i x)";
-
-(*I.E TRY THIS*)
-Goal "{F. F = (plam j:UNIV. drop_prog j F)} Int (INT i. stable (lift_set i A)) \
-\     <= (INT i. lift_prog i `` stable A)";
-
-
-Goal "{F. F = (plam j:UNIV. drop_prog j F)} Int stable (lift_set i A) \
-\     <= lift_prog i `` stable A";
-by Auto_tac;
-fr image_eqI;
-by (etac (drop_prog_stable_eq RS iffD2) 2);
-by (etac ssubst 1);
-by (stac drop_prog_plam_eq 1);
-by Auto_tac;
-
-
-by (asm_simp_tac (simpset() addsimps [lift_prog_Stable_eq]) 1);
-qed "image_lift_prog_Stable";
-
-
-Goal "{F. F = (plam i:UNIV. drop_prog i F)} Int stable {s. P (f (s i))} \
-\     <= lift_prog i `` stable {s. P (f s)}";
-by (stac (lift_set_sub2 RS sym) 1); 
-
-
-Goal "Cl : (f localTo F) guar Increasing f   ==> \
-\ lift_prog i Cl : (f o sub i) localTo (lift_prog i F)  \
-\                  guar Increasing (f o sub i)";
-by (dtac lift_prog_guarantees 1);
-by (etac guarantees_weaken 1);
-by (rtac image_lift_prog_Increasing 2);
-
-
-
-
-
-
-
-Goal "(f o sub i) localTo (lift_prog i F) <= lift_prog i `` (f localTo F)";
-
-
-
-
-
-
-Goal "(f o sub i) localTo (lift_prog i F) <= lift_prog i `` (f localTo F)";
-by (simp_tac (simpset() addsimps [localTo_def]) 1);
-by Auto_tac;
-by (dres_inst_tac [("x","z")] spec 1);
-by Auto_tac;
-by (asm_simp_tac (simpset() addsimps [lift_set_sub2 RS sym,
-				      lift_prog_stable_eq]) 1);
-qed "image_lift_prog_?";
-
-Goal "{GX. EX G: UNIV. lift_prog i G component GX} = UNIV";
-by Auto_tac;
-by (asm_full_simp_tac (simpset() addsimps [component_eq_subset]) 1);
-by (asm_full_simp_tac (simpset() addsimps [lift_set_def]) 1);
-ren "GX" 1;
-by (res_inst_tac [("x", "mk_program((%f. f i)``(Init GX), drop_act i `` Acts GX)")] exI 1);
-by Auto_tac;
-
-
-
-
-(*quantified formula's too strong and yet too weak.
-  Close to what's needed, but maybe need further restrictions on X, Y*)
-Goal "[| F : (drop_prog i `` X) guar (drop_prog i `` Y);  \
-\        ALL j: -{i}. drop_prog j `` X <= drop_prog j `` Y |] \
-\     ==> lift_prog i F : X guar Y";
-by (rtac guaranteesI 1);
-by (dtac guaranteesD 1);
-by (rtac image_eqI 1);
-by (rtac (drop_prog_lift_prog_Join RS sym) 1);
-by (assume_tac 1);
-by Auto_tac;
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join RS sym]) 1);
-by (subgoal_tac "ALL k. drop_prog k (lift_prog i F Join G) = drop_prog k x" 1);
-by (Clarify_tac 2);
-by (case_tac "k=i" 2);
-by (Blast_tac 2);
-
-by (dres_inst_tac [("f", "lift_prog i")] arg_cong 1);
-by (asm_full_simp_tac (simpset() addsimps [singleton_drop_prog_inverse]) 1);
-
-by (dtac sym 1);
-by (Blast_tac 1);
-qed "drop_prog_guarantees";
-
-Goalw [guarantees_def]
-    "[| F : (X Int A) guar (Y Int A);  \
-\       F : (X Int B) guar (Y Int B);  \
-\       UNIV <= A Un B |] \
-\    ==> F : X guar Y";
-by (Blast_tac 1);
-qed "guarantees_Un_partition_I";
-
-Goalw [guarantees_def]
-    "[| ALL i:I. F : (X Int A i) guar (Y Int A i);  UNIV <= UNION I A |] \
-\    ==> F : X guar Y";
-by (Blast_tac 1);
-qed "guarantees_UN_partition_I";
-
-Goal "{G. G component (JN j: I-{i}. JN H: UNIV. lift_prog j H)} \
-\     <= stable (lift_set i A)";
-by (Clarify_tac 1);
-by (etac (component_JN_neq_imp_Idle RS Idle_imp_stable_lift_set) 1);
-result();
-
-Goal "i~=j ==> (lift_prog j `` UNIV) <= Increasing (f o sub i)";
-by (rewtac Increasing_def);
-by Auto_tac;
-by (stac (lift_set_sub2 RS sym) 1); 
-by (blast_tac (claset() addIs [neq_imp_lift_prog_Stable]) 1);
-result();
-
-Goal "Cl : UNIV guar Increasing f   ==> \
-\ lift_prog i Cl : {G. G component (JN j: I. JN H: UNIV. lift_prog j H)} \
-\                  guar Increasing (f o sub i)";
-by (rtac guarantees_partition_I 1);
-by (simp_tac (simpset() addsimps []) 1);
-
-by (dtac lift_prog_guarantees 1);
-by (etac guarantees_weaken 1);
-by Auto_tac;
-by (rtac (impOfSubs image_lift_prog_Increasing) 1);
-by Auto_tac;
-result();
-
-
-Goal "drop_prog i `` UNIV = UNIV";
-by Auto_tac;
-fr image_eqI;
-by (rtac (lift_prog_inverse RS sym) 1);
-by Auto_tac;
-result();
-
-
-Goal "x : reachable (drop_prog i F) ==> x : drop_set i (reachable F)";
-by (etac reachable.induct 1);
-by Auto_tac;
-by (rewtac drop_set_def);
-by (force_tac (claset() addIs [reachable.Init, drop_set_I],
-	       simpset()) 1);
-by (rewtac drop_act_def);
-by Auto_tac;
-by (rtac imageI 1);
-by (rtac reachable.Acts 1);
-by (assume_tac 1);
-by (assume_tac 1);
-
-
-Goal "reachable (drop_prog i F) = drop_set i (reachable F)";
-by (rewtac drop_set_def);
-by Auto_tac;
-by (etac reachable_imp_reachable_drop_prog 2);
-
-
-
-
-
-Goalw [Constrains_def]
-     "(F : (lift_set i A) Co (lift_set i B)) \
-\     ==> (drop_prog i F : A Co B)";
-by (full_simp_tac (simpset() addsimps [drop_prog_constrains_eq]) 1);
-by (etac constrains_weaken_L 1);
-
-by Auto_tac;
-by (force_tac (claset(), 
-	       simpset() addsimps [drop_act_def]) 2);
-by (blast_tac (claset() addIs [drop_act_I]) 1);
-qed "drop_prog_Constrains_eq";
-
-
-(*Does NOT appear to be provable, so this notion of modular is too strong*)
-Goal "lift_prog i `` drop_prog i `` Increasing (f o sub i) \
-\        <= Increasing (f o sub i)";
-by (simp_tac (simpset() addsimps [Increasing_def]) 1);
-by Auto_tac;
-by (stac (lift_set_sub2 RS sym) 1); 
-by (simp_tac (simpset() addsimps [lift_prog_Stable_eq]) 1);
-
-
-
-
-
-Goal "[| F : (drop_prog i `` X) guar (drop_prog i `` Y);  \
-\        X <= (UN F. {lift_prog i F});  \
-\        lift_prog i `` drop_prog i `` Y <= Y |] \
-\     ==> lift_prog i F : X guar Y";
-by (rtac guaranteesI 1);
-by (set_mp_tac 1);
-by (Clarify_tac 1);
-by (dtac guaranteesD 1);
-by (rtac image_eqI 1);
-by (rtac (drop_prog_lift_prog_Join RS sym) 1);
-by (assume_tac 1);
-by Auto_tac;
-by (asm_full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join RS sym]) 1);
-by Auto_tac;
-qed "drop_prog_guarantees";
-
-
-
-NEW NOTION OF MODULAR
-
-
-Goal "(ALL H:X. lift_prog i (drop_prog i H) : X) = \
-\     (lift_prog i `` drop_prog i `` X <= X)";
-by Auto_tac;
-qed "modular_equiv";
-
-Goal "lift_prog i `` drop_prog i `` (lift_prog i `` F) <= lift_prog i `` F";
-by (simp_tac (simpset() addsimps [image_compose RS sym, o_def]) 1);
-result();
-
-Goal "[| F : (drop_prog i `` X) guar (drop_prog i `` Y);  \
-\        lift_prog i `` drop_prog i `` X <= X;  \
-\        lift_prog i `` drop_prog i `` Y <= Y|] \
-\     ==> lift_prog i F : X guar Y";
-by (full_simp_tac (simpset() addsimps [modular_equiv RS sym]) 1);
-by (rtac guaranteesI 1);
-by (ball_tac 1);
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join]) 1);
-by (dtac guaranteesD 1);
-by (rtac image_eqI 1);
-by (assume_tac 2);back();
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join]) 1);
-by (ALLGOALS Clarify_tac);
-by (dres_inst_tac [("f", "lift_prog i")] arg_cong 1);
-
-by (rtac guaranteesI 1);
-by (dtac guaranteesD 1);
-by (ALLGOALS Clarify_tac);
-by (rtac image_eqI 1);
-by (rtac (drop_prog_lift_prog_Join RS sym) 1);
-by (assume_tac 1);
-by (full_simp_tac (simpset() addsimps [modular_equiv RS sym]) 1);
-by (REPEAT (ball_tac 1));
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join]) 1);
-ren "H" 1;
-by (dtac sym 1);
-by (asm_full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join]) 1);
-????????????????;
-
-by Auto_tac;
-
-by (dres_inst_tac [("f", "drop_prog i")] arg_cong 1);
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join]) 1);
-by (assume_tac 1);
-by (ALLGOALS Clarify_tac);
-by (set_mp_tac 1);
-by (ALLGOALS Clarify_tac);
-by Auto_tac;
-by (dres_inst_tac [("f", "drop_prog i")] arg_cong 1);
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join]) 1);
-by Auto_tac;
-qed "drop_prog_guarantees";
-
-
-
-
-
-
-
-
-Goal "(lift_prog i `` F) <= lift_prog i `` drop_prog i `` (lift_prog i `` F)";
-by (simp_tac (simpset() addsimps [image_compose RS sym, o_def]) 1);
-by Auto_tac;
-result();
-
-
-
-
-
-(*FAILS*)
-Goal "modular i (lift_prog i `` Y)";
-
-
-
-
-
-Goal "Cl : UNIV guar Increasing f \
-\     ==>lift_prog i Cl : UNIV guar Increasing (f o sub i)";
-by (rtac drop_prog_guarantees 1);
-by (rewtac Increasing_def);
-by (etac guarantees_weaken 1);
-by Auto_tac;
-by (rtac image_eqI 1);
-by (rtac (lift_prog_inverse RS sym) 1);
-by Auto_tac;
-by (stac (lift_set_sub2 RS sym) 1); 
-by (asm_simp_tac (simpset() addsimps [lift_prog_Stable_eq]) 1);
-
-
-
-(*could move to PPROD.ML, but function "sub" is needed there*)
-Goalw [drop_set_def] "drop_set i {s. P (f (sub i s))} = {s. P (f s)}";
-by Auto_tac;
-qed "drop_set_sub";
-
-Goal "lift_set i (reachable (drop_prog i F)) = reachable F";
-
-(*False?*)
-Goal "modular i ((f o sub i) localTo (lift_prog i F))";
-by (simp_tac (simpset() addsimps [localTo_def, modular_def]) 1);
-by Auto_tac;
-
-
-
-(*FAILS*)
-Goal "(drop_prog i F : A Co B)  =  \
-\     (F : (lift_set i A) Co (lift_set i B))";
-by (simp_tac (simpset() addsimps [Constrains_def, drop_prog_constrains_eq,
-				  lift_set_Int]) 1);
-
-??
-by (simp_tac (simpset() addsimps [Constrains_def, reachable_drop_prog,
-				  drop_set_Int RS sym,
-				  drop_prog_constrains_eq]) 1);
-qed "drop_prog_Constrains_eq";
-
-(*FAILS*)
-Goal "(drop_prog i F : Stable A)  =  (F : Stable (lift_set i A))";
-by (simp_tac (simpset() addsimps [Stable_def, drop_prog_Constrains_eq]) 1);
-qed "drop_prog_Stable_eq";
-
-
-(*FAILS*)
-Goal "modular i (Stable {s. P(s i)})";
-by (full_simp_tac (simpset() addsimps [modular_def,
-				       drop_prog_lift_prog_Join RS sym]) 1);
-by (full_simp_tac (simpset() addsimps [lift_set_sub2 RS sym,
-				      lift_prog_Stable_eq]) 1);
-by Auto_tac;
-
-
-
-Goal "modular i (Increasing (rel o sub i))";
-by (full_simp_tac (simpset() addsimps [modular_def, Increasing_def,
-				       drop_prog_lift_prog_Join RS sym]) 1);
-
-
-Goal "modular i (lift_prog i `` X)";
-by (full_simp_tac (simpset() addsimps [modular_def,
-				       drop_prog_lift_prog_Join RS sym]) 1);
-
 
 
 Goal "i < Nclients ==> \
@@ -643,90 +93,6 @@
 yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy;
 
 
-!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!;
-(*Precondition is TOO STRONG*)
-Goal "Cl : UNIV guar Increasing f \
-\     ==>lift_prog i Cl : (lift_prog i `` UNIV) guar Increasing (f o sub i)";
-by (rtac drop_prog_guarantees 1);
-by (etac guarantees_weaken 1);
-by Auto_tac;
-by (rtac (impOfSubs image_lift_prog_Increasing) 2);
-by (rtac image_eqI 1);
-by (rtac (lift_prog_inverse RS sym) 1);
-by (rtac (impOfSubs image_lift_prog_Increasing) 1);
-by Auto_tac;
-fr imageI;
-
-by (stac (lift_set_sub2 RS sym) 1); 
-by (asm_simp_tac (simpset() addsimps [lift_prog_Stable_eq]) 1);
-
-
-
-by (full_simp_tac
-    (simpset() addsimps [alloc_spec_def, alloc_safety_def, System_def]) 1);
-
-
-
-
-Goal "[| F : (drop_prog i `` XX) guar Y;    \
-\        ALL Z:XX. Z component (JN i:UNIV. JN G:UNIV. lift_prog i G) |] \
-\     ==> lift_prog i F : XX guar (lift_prog i `` Y)";
-by (rtac guaranteesI 1);
-by (dtac guaranteesD 1);
-by (ball_tac 1);
-by (full_simp_tac (simpset() addsimps [Join_component_iff]) 1);
-by (full_simp_tac (simpset() addsimps [component_eq_subset, Acts_JN]) 1);
-
-by (rtac image_eqI 2);
-by (assume_tac 3);
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join RS sym]) 2);
-
-by (rtac (drop_prog_lift_prog_Join RS sym) 1);
-by (assume_tac 1);
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join RS sym]) 1);
-by (rtac image_eqI 1);
-by (assume_tac 2);
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join]) 1);
-
-by (rtac guaranteesI 1);
-by (dtac guaranteesD 1);
-by (rtac image_eqI 1);
-by (rtac (drop_prog_lift_prog_Join RS sym) 1);
-by (assume_tac 1);
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join RS sym]) 1);
-by (rtac image_eqI 1);
-by (assume_tac 2);
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join]) 1);
-
-
-by (dtac sym 1);
-by (Blast_tac 1);
-
-
-by (rtac guaranteesI 1);
-by (dtac guaranteesD 1);
-by (rtac image_eqI 2);
-by (assume_tac 3);
-
-
-Goal "F : X guar Y \
-\     ==> lift_prog i F : XX guar (lift_prog i `` Y)";
-by (rtac guaranteesI 1);
-by (dtac guaranteesD 1);
-by (rtac image_eqI 2);
-by (assume_tac 3);
-
-by Auto_tac;
-by (blast_tac (claset() addDs [lift_prog_Join_eq_lift_prog_D, guaranteesD]) 1);
-qed "lift_prog_guarantees";
-
-
-
-
-
-
-
-
 (*partial system...*)
 Goal "[| Alloc : alloc_spec;  Network : network_spec |] \
 \     ==> (extend sysOfAlloc Alloc) Join Network : system_spec";
@@ -761,69 +127,3 @@
 by Auto_tac;
 
 by (Simp_tac 1);
-
-
-
-
-Goal "[| F : (drop_prog i `` X) guar (drop_prog i `` Y);  \
-\        X <= lift_prog i `` drop_prog i `` X;  \
-\        Y <= lift_prog i `` drop_prog i `` Y |] \
-\     ==> lift_prog i F : X guar Y";
-by (rtac guaranteesI 1);
-by (set_mp_tac 1);
-by (ALLGOALS Clarify_tac);
-by (dtac guaranteesD 1);
-by (rtac image_eqI 1);
-by (dres_inst_tac [("f", "drop_prog i")] arg_cong 1);
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join]) 1);
-by (assume_tac 1);
-by (ALLGOALS Clarify_tac);
-by (set_mp_tac 1);
-by (ALLGOALS Clarify_tac);
-by Auto_tac;
-by (dres_inst_tac [("f", "drop_prog i")] arg_cong 1);
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join]) 1);
-by Auto_tac;
-qed "drop_prog_guarantees";
-
-
-
-
-(*****SINGLETON LEMMAS: GOOD FOR ANYTHING??????***)
-
-(*Because A and B could differ outside i, cannot generalize result to 
-   drop_set i (A Int B) = drop_set i A Int drop_set i B
-*)
-Goal "[| ALL j. j = i; f i = g i |] ==> f = g";
-by (rtac ext 1);
-by (dres_inst_tac [("x", "x")] spec 1);
-by Auto_tac;
-qed "singleton_ext";
-
-Goalw [lift_set_def, drop_set_def]
-     "ALL j. j = i ==> lift_set i (drop_set i A) = A";
-by (blast_tac (claset() addSDs [singleton_ext]) 1);
-qed "singleton_drop_set_inverse";
-
-Goal "ALL j. j = i ==> f(i:= g i) = g";
-by (dres_inst_tac [("x", "x")] spec 1);
-by Auto_tac;
-qed "singleton_update_eq";
-
-Goalw [lift_act_def, drop_act_def]
-     "ALL j. j = i ==> lift_act i (drop_act i act) = act";
-by Auto_tac;
-by (asm_simp_tac (simpset() addsimps [singleton_update_eq]) 1);
-by (dtac singleton_ext 1);
-by (assume_tac 1);
-by (auto_tac (claset() addSIs [exI, image_eqI], 
-	      simpset() addsimps [singleton_update_eq]));
-qed "singleton_drop_act_inverse";
-
-Goal "ALL j. j = i ==> lift_prog i (drop_prog i F) = F";
-by (rtac program_equalityI 1);
-by (asm_simp_tac (simpset() addsimps [singleton_drop_set_inverse]) 1);
-by (asm_simp_tac (simpset() addsimps [image_compose RS sym, o_def,
-				      singleton_drop_act_inverse]) 1);
-qed "singleton_drop_prog_inverse";
-
diff -r 676027b1d770 -r 2bc63a44721b src/HOL/UNITY/Alloc.thy
--- a/src/HOL/UNITY/Alloc.thy	Fri Aug 06 17:28:45 1999 +0200
+++ b/src/HOL/UNITY/Alloc.thy	Fri Aug 06 17:29:18 1999 +0200
@@ -8,23 +8,6 @@
 
 Alloc = Follows + Extend + PPROD +
 
-constdefs
-  (**TOO STRONG: DELETE**)
-  modular :: "['a, ('a=>'b) program set] => bool"
-    "modular i X ==
-       ALL F G. F : X --> drop_prog i F = drop_prog i G --> G : X"
-
-
- (*UNITY.thy????????????????*)
-  (*An Idle program can do nothing*)
-  Idle :: 'a program set
-    "Idle == {F. Union (Acts F) <= Id}"
-
-(*simplifies the expression of some specifications*)
-constdefs
-  sub :: ['a, 'a=>'b] => 'b
-    "sub i f == f i"
-
 (*Duplicated from HOL/ex/NatSum.thy.
   Maybe type should be  [nat=>int, nat] => int**)
 consts sum     :: [nat=>nat, nat] => nat
diff -r 676027b1d770 -r 2bc63a44721b src/HOL/UNITY/PPROD.ML
--- a/src/HOL/UNITY/PPROD.ML	Fri Aug 06 17:28:45 1999 +0200
+++ b/src/HOL/UNITY/PPROD.ML	Fri Aug 06 17:29:18 1999 +0200
@@ -1,183 +1,25 @@
 (*  Title:      HOL/UNITY/PPROD.ML
     ID:         $Id$
     Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
-    Copyright   1998  University of Cambridge
+    Copyright   1999  University of Cambridge
+
+Abstraction over replicated components (PLam)
+General products of programs (Pi operation)
+
+It is not clear that any of this is good for anything.
 *)
 
 
 val rinst = read_instantiate_sg (sign_of thy);
 
-(**** PPROD ****)
 
 (*** Basic properties ***)
 
-(** lift_set and drop_set **)
-
-Goalw [lift_set_def] "(f : lift_set i A) = (f i : A)";
-by Auto_tac;
-qed "lift_set_iff";
-AddIffs [lift_set_iff];
-
-Goalw [lift_set_def] "lift_set i (A Int B) = lift_set i A Int lift_set i B";
-by Auto_tac;
-qed "lift_set_Int";
-
-(*USED?? converse fails*)
-Goalw [drop_set_def] "f : A ==> f i : drop_set i A";
-by Auto_tac;
-qed "drop_set_I";
-
-(** lift_act and drop_act **)
-
-Goalw [lift_act_def] "lift_act i Id = Id";
-by Auto_tac;
-by (etac rev_mp 1);
-by (dtac sym 1);
-by (asm_simp_tac (simpset() addsimps [fun_upd_idem_iff]) 1);
-qed "lift_act_Id";
-Addsimps [lift_act_Id];
-
-Goalw [drop_act_def] "(s, s') : act ==> (s i, s' i) : drop_act i act";
-by (auto_tac (claset() addSIs [image_eqI], simpset()));
-qed "drop_act_I";
-
-Goalw [drop_act_def] "drop_act i Id = Id";
-by Auto_tac;
-by (res_inst_tac [("x", "((%u. x), (%u. x))")] image_eqI 1);
-by Auto_tac;
-qed "drop_act_Id";
-Addsimps [drop_act_Id];
-
-(** lift_prog and drop_prog **)
-
-Goalw [lift_prog_def] "Init (lift_prog i F) = lift_set i (Init F)";
-by Auto_tac;
-qed "Init_lift_prog";
-Addsimps [Init_lift_prog];
-
-Goalw [lift_prog_def] "Acts (lift_prog i F) = lift_act i `` Acts F";
-by (auto_tac (claset() addIs [Id_in_Acts RSN (2,image_eqI)], simpset()));
-qed "Acts_lift_prog";
-Addsimps [Acts_lift_prog];
-
-Goalw [drop_prog_def] "Init (drop_prog i F) = drop_set i (Init F)";
-by Auto_tac;
-qed "Init_drop_prog";
-Addsimps [Init_drop_prog];
-
-Goalw [drop_prog_def] "Acts (drop_prog i F) = drop_act i `` Acts F";
-by (auto_tac (claset() addIs [Id_in_Acts RSN (2,image_eqI)], simpset()));
-qed "Acts_drop_prog";
-Addsimps [Acts_drop_prog];
-
-Goal "F component G ==> lift_prog i F component lift_prog i G";
-by (full_simp_tac (simpset() addsimps [component_eq_subset]) 1);
-by Auto_tac;
-qed "lift_prog_mono";
-
-Goal "F component G ==> drop_prog i F component drop_prog i G";
-by (full_simp_tac (simpset() addsimps [component_eq_subset, drop_set_def]) 1);
-by Auto_tac;
-qed "drop_prog_mono";
-
-Goal "lift_prog i SKIP = SKIP";
-by (auto_tac (claset() addSIs [program_equalityI],
-	      simpset() addsimps [SKIP_def, lift_prog_def]));
-qed "lift_prog_SKIP";
-
-Goal "lift_prog i (F Join G) = (lift_prog i F) Join (lift_prog i G)";
-by (rtac program_equalityI 1);
-by (auto_tac (claset(), simpset() addsimps [Acts_Join]));
-qed "lift_prog_Join";
-
-Goal "lift_prog i (JOIN I F) = (JN j:I. lift_prog i (F j))";
-by (rtac program_equalityI 1);
-by (auto_tac (claset(), simpset() addsimps [Acts_JN]));
-qed "lift_prog_JN";
-
-Goal "drop_prog i SKIP = SKIP";
-by (auto_tac (claset() addSIs [program_equalityI],
-	      simpset() addsimps [SKIP_def, drop_set_def, drop_prog_def]));
-qed "drop_prog_SKIP";
-
-
-(** Injectivity of lift_set, lift_act, lift_prog **)
-
-Goalw [lift_set_def, drop_set_def] "drop_set i (lift_set i F) = F";
-by Auto_tac;
-qed "lift_set_inverse";
-Addsimps [lift_set_inverse];
-
-Goal "inj (lift_set i)";
-by (rtac inj_on_inverseI 1);
-by (rtac lift_set_inverse 1);
-qed "inj_lift_set";
-
-(*Because A and B could differ outside i, cannot generalize result to 
-   drop_set i (A Int B) = drop_set i A Int drop_set i B
-*)
-Goalw [lift_set_def, drop_set_def]
-     "drop_set i ((lift_set i A) Int B) = A Int (drop_set i B)";
-by Auto_tac;
-qed "drop_set_lift_set_Int";
-
-Goalw [lift_set_def, drop_set_def]
-     "drop_set i (B Int (lift_set i A)) = (drop_set i B) Int A";
-by Auto_tac;
-qed "drop_set_lift_set_Int2";
-
-Goalw [drop_set_def]
-     "i : I ==> drop_set i (INT j:I. lift_set j A) = A";
-by Auto_tac;
-qed "drop_set_INT";
-
-Goalw [lift_act_def, drop_act_def] "drop_act i (lift_act i act) = act";
-by Auto_tac;
-by (res_inst_tac [("x", "f(i:=a)")] exI 1);
-by (Asm_simp_tac 1);
-by (res_inst_tac [("x", "f(i:=b)")] exI 1);
-by (Asm_simp_tac 1);
-by (rtac ext 1);
-by (Asm_simp_tac 1);
-qed "lift_act_inverse";
-Addsimps [lift_act_inverse];
-
-Goal "inj (lift_act i)";
-by (rtac inj_on_inverseI 1);
-by (rtac lift_act_inverse 1);
-qed "inj_lift_act";
-
-Goal "drop_prog i (lift_prog i F) = F";
-by (simp_tac (simpset() addsimps [lift_prog_def, drop_prog_def]) 1);
-by (rtac program_equalityI 1);
-by (simp_tac (simpset() addsimps [image_compose RS sym, o_def]) 2);
-by (Simp_tac 1);
-qed "lift_prog_inverse";
-Addsimps [lift_prog_inverse];
-
-Goal "inj (lift_prog i)";
-by (rtac inj_on_inverseI 1);
-by (rtac lift_prog_inverse 1);
-qed "inj_lift_prog";
-
-
-(** PLam **)
-
 Goalw [PLam_def] "Init (PLam I F) = (INT i:I. lift_set i (Init (F i)))";
 by Auto_tac;
 qed "Init_PLam";
 Addsimps [Init_PLam];
 
-(*For compatibility with the original definition and perhaps simpler proofs*)
-Goalw [lift_act_def]
-    "((f,f') : lift_act i act) = (EX s'. f' = f(i := s') & (f i, s') : act)";
-by Auto_tac;
-by (rtac exI 1);
-by Auto_tac;
-qed "lift_act_eq";
-AddIffs [lift_act_eq];
-
-
 Goal "Acts (PLam I F) = insert Id (UN i:I. lift_act i `` Acts (F i))";
 by (auto_tac (claset(),
 	      simpset() addsimps [PLam_def, Acts_JN]));
@@ -204,51 +46,7 @@
 qed "component_PLam";
 
 
-(*** Safety: co, stable, invariant ***)
-
-(** Safety and lift_prog **)
-
-Goal "(lift_prog i F : (lift_set i A) co (lift_set i B))  =  \
-\     (F : A co B)";
-by (auto_tac (claset(), 
-	      simpset() addsimps [constrains_def]));
-by (Blast_tac 2);
-by (Force_tac 1);
-qed "lift_prog_constrains_eq";
-
-Goal "(lift_prog i F : stable (lift_set i A)) = (F : stable A)";
-by (simp_tac (simpset() addsimps [stable_def, lift_prog_constrains_eq]) 1);
-qed "lift_prog_stable_eq";
-
-(*This one looks strange!  Proof probably is by case analysis on i=j.
-  If i~=j then lift_prog j (F j) does nothing to lift_set i, and the 
-  premise ensures A<=B.*)
-Goal "F i : A co B  \
-\     ==> lift_prog j (F j) : (lift_set i A) co (lift_set i B)";
-by (auto_tac (claset(), 
-	      simpset() addsimps [constrains_def]));
-by (REPEAT (Blast_tac 1));
-qed "constrains_imp_lift_prog_constrains";
-
-(** safety properties for program unit j hold trivially of unit i **)
-Goalw [constrains_def]
-     "[| i~=j;  A<= B|] ==> lift_prog i F : (lift_set j A) co (lift_set j B)";
-by Auto_tac;
-qed "neq_imp_lift_prog_constrains";
-
-Goalw [stable_def]
-     "i~=j ==> lift_prog i F : stable (lift_set j A)";
-by (blast_tac (claset() addIs [neq_imp_lift_prog_constrains]) 1);
-qed "neq_imp_lift_prog_stable";
-
-bind_thm ("neq_imp_lift_prog_Constrains",
-	  neq_imp_lift_prog_constrains RS constrains_imp_Constrains);
-
-bind_thm ("neq_imp_lift_prog_Stable",
-	  neq_imp_lift_prog_stable RS stable_imp_Stable);
-
-
-(** Safety and PLam **)
+(** Safety **)
 
 Goal "i : I ==>  \
 \     (PLam I F : (lift_set i A) co (lift_set i B))  =  \
@@ -262,33 +60,26 @@
 by (asm_simp_tac (simpset() addsimps [stable_def, PLam_constrains]) 1);
 qed "PLam_stable";
 
-
-(** Safety, lift_prog + drop_set **)
-
+(*Possibly useful in Lift_set.ML?*)
 Goal "[| lift_prog i F : AA co BB |] \
 \     ==> F : (drop_set i AA) co (drop_set i BB)";
 by (auto_tac (claset(), 
 	      simpset() addsimps [constrains_def, drop_set_def]));
 by (force_tac (claset() addSIs [rinst [("x", "?ff(i := ?u)")] image_eqI],
 	       simpset()) 1);
-qed "lift_prog_constrains_projection";
+qed "lift_prog_constrains_drop_set";
 
 Goal "[| PLam I F : AA co BB;  i: I |] \
 \     ==> F i : (drop_set i AA) co (drop_set i BB)";
-by (rtac lift_prog_constrains_projection 1);
+by (rtac lift_prog_constrains_drop_set 1);
 (*rotate this assumption to be last*)
 by (dres_inst_tac [("psi", "PLam I F : ?C")] asm_rl 1);
 by (asm_full_simp_tac (simpset() addsimps [PLam_def, constrains_JN]) 1);
-qed "PLam_constrains_projection";
+qed "PLam_constrains_drop_set";
 
 
 (** invariant **)
 
-Goal "(lift_prog i F : invariant (lift_set i A)) = (F : invariant A)";
-by (auto_tac (claset(),
-	      simpset() addsimps [invariant_def, lift_prog_stable_eq]));
-qed "lift_prog_invariant_eq";
-
 Goal "[| F i : invariant A;  i : I |] \
 \     ==> PLam I F : invariant (lift_set i A)";
 by (auto_tac (claset(),
@@ -319,46 +110,7 @@
 qed "const_PLam_invariant";
 
 
-(*** Substitution Axiom versions: Co, Stable ***)
-
-(*** Reachability ***)
-
-(** for lift_prog **)
-
-Goal "s : reachable F ==> f(i:=s) : reachable (lift_prog i F)";
-by (etac reachable.induct 1);
-by (force_tac (claset() addIs [reachable.Acts, ext], 
-	       simpset()) 2);
-by (force_tac (claset() addIs [reachable.Init], simpset()) 1);
-qed "reachable_lift_progI";
-
-Goal "f : reachable (lift_prog i F) ==> f i : reachable F";
-by (etac reachable.induct 1);
-by Auto_tac;
-by (ALLGOALS (blast_tac (claset() addIs reachable.intrs)));
-qed "reachable_lift_progD";
-
-Goal "reachable (lift_prog i F) = lift_set i (reachable F)";
-by Auto_tac;
-by (etac reachable_lift_progD 1);
-ren "f" 1;
-by (dres_inst_tac [("f","f"),("i","i")] reachable_lift_progI 1);
-by Auto_tac;
-qed "reachable_lift_prog";
-
-Goal "(lift_prog i F : (lift_set i A) Co (lift_set i B))  =  \
-\     (F : A Co B)";
-by (simp_tac (simpset() addsimps [Constrains_def, reachable_lift_prog,
-				  lift_set_Int RS sym,
-				  lift_prog_constrains_eq]) 1);
-qed "lift_prog_Constrains_eq";
-
-Goal "(lift_prog i F : Stable (lift_set i A)) = (F : Stable A)";
-by (simp_tac (simpset() addsimps [Stable_def, lift_prog_Constrains_eq]) 1);
-qed "lift_prog_Stable_eq";
-
-
-(** Reachability for PLam **)
+(** Reachability **)
 
 Goal "[| f : reachable (PLam I F);  i : I |] ==> f i : reachable (F i)";
 by (etac reachable.induct 1);
@@ -450,7 +202,7 @@
 by (full_simp_tac (simpset() addsimps [Constrains_eq_constrains]) 1);
 by (subgoal_tac "ALL i:I. f0 i : reachable (F i)" 1);
 by (blast_tac (claset() addIs [reachable.Init]) 2);
-by (dtac PLam_constrains_projection 1);
+by (dtac PLam_constrains_drop_set 1);
 by (assume_tac 1);
 by (asm_full_simp_tac
     (simpset() addsimps [drop_set_lift_set_Int2,
@@ -478,7 +230,7 @@
 \        i: I;  finite I |]  \
 \     ==> F : A Co B";
 by (full_simp_tac (simpset() addsimps [Constrains_eq_constrains]) 1);
-by (dtac PLam_constrains_projection 1);
+by (dtac PLam_constrains_drop_set 1);
 by (assume_tac 1);
 by (asm_full_simp_tac
     (simpset() addsimps [drop_set_INT,
@@ -498,31 +250,18 @@
 by (asm_simp_tac (simpset() addsimps [Stable_def, const_PLam_Constrains]) 1);
 qed "const_PLam_Stable";
 
+Goalw [Increasing_def]
+     "[| i: I;  finite I |]  \
+\     ==> ((plam x:I. F) : Increasing (f o sub i)) = (F : Increasing f)";
+by (subgoal_tac "ALL z. {s. z <= (f o sub i) s} = lift_set i {s. z <= f s}" 1);
+by (asm_simp_tac (simpset() addsimps [lift_set_sub]) 2);
+by (asm_full_simp_tac
+    (simpset() addsimps [finite_lessThan, const_PLam_Stable]) 1);
+qed "const_PLam_Increasing";
 
 
 (*** guarantees properties ***)
 
-Goal "drop_prog i ((lift_prog i F) Join G) = F Join (drop_prog i G)";
-by (rtac program_equalityI 1);
-by (simp_tac (simpset() addsimps [Acts_Join, image_Un,
-				  image_compose RS sym, o_def]) 2);
-by (simp_tac (simpset() addsimps [drop_set_lift_set_Int]) 1);
-qed "drop_prog_lift_prog_Join";
-
-Goal "(lift_prog i F) Join G = lift_prog i H \
-\     ==> H = F Join (drop_prog i G)";
-by (dres_inst_tac [("f", "drop_prog i")] arg_cong 1);
-by (full_simp_tac (simpset() addsimps [drop_prog_lift_prog_Join]) 1);
-by (etac sym 1);
-qed "lift_prog_Join_eq_lift_prog_D";
-
-Goal "F : X guar Y \
-\     ==> lift_prog i F : (lift_prog i `` X) guar (lift_prog i `` Y)";
-by (rtac guaranteesI 1);
-by Auto_tac;
-by (blast_tac (claset() addDs [lift_prog_Join_eq_lift_prog_D, guaranteesD]) 1);
-qed "lift_prog_guarantees";
-
 Goalw [PLam_def]
     "[| ALL i:I. F i : X guar Y |] \
 \    ==> (PLam I F) : (INT i: I. lift_prog i `` X) \
diff -r 676027b1d770 -r 2bc63a44721b src/HOL/UNITY/PPROD.thy
--- a/src/HOL/UNITY/PPROD.thy	Fri Aug 06 17:28:45 1999 +0200
+++ b/src/HOL/UNITY/PPROD.thy	Fri Aug 06 17:29:18 1999 +0200
@@ -3,36 +3,14 @@
     Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
     Copyright   1998  University of Cambridge
 
-General products of programs (Pi operation), for replicating components.
+Abstraction over replicated components (PLam)
+General products of programs (Pi operation)
 *)
 
-PPROD = Union + Comp +
+PPROD = Lift_prog +
 
 constdefs
 
-  lift_set :: "['a, 'b set] => ('a => 'b) set"
-    "lift_set i A == {f. f i : A}"
-
-  drop_set :: "['a, ('a=>'b) set] => 'b set"
-    "drop_set i A == (%f. f i) `` A"
-
-  lift_act :: "['a, ('b*'b) set] => (('a=>'b) * ('a=>'b)) set"
-    "lift_act i act == {(f,f'). f(i:= f' i) = f' & (f i, f' i) : act}"
-
-  drop_act :: "['a, (('a=>'b) * ('a=>'b)) set] => ('b*'b) set"
-    "drop_act i act == (%(f,f'). (f i, f' i)) `` act"
-
-  lift_prog :: "['a, 'b program] => ('a => 'b) program"
-    "lift_prog i F ==
-       mk_program (lift_set i (Init F),
-		   lift_act i `` Acts F)"
-
-  drop_prog :: "['a, ('a=>'b) program] => 'b program"
-    "drop_prog i F ==
-       mk_program (drop_set i (Init F),
-		   drop_act i `` (Acts F))"
-
-  (*products of programs*)
   PLam  :: ['a set, 'a => 'b program] => ('a => 'b) program
     "PLam I F == JN i:I. lift_prog i (F i)"