src/Modal/s43.thy
changeset 0 a5a9c433f639
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Modal/s43.thy	Thu Sep 16 12:20:38 1993 +0200
@@ -0,0 +1,79 @@
+(*  Title: 	91/Modal/S43
+    ID:         $Id$
+    Author: 	Martin Coen
+    Copyright   1991  University of Cambridge
+
+This implements Rajeev Gore's sequent calculus for S43.
+*)
+
+S43 = Modal0 +
+
+consts
+  S43pi	:: "[sobj=>sobj, sobj=>sobj, sobj=>sobj,\
+\	     sobj=>sobj, sobj=>sobj, sobj=>sobj] => prop"
+  "@S43pi" :: "[sequence, sequence, sequence, sequence, sequence,\
+\		sequence] => prop" ("S43pi((_);(_);(_);(_);(_);(_))" [] 5)
+
+rules
+(* Definition of the star operation using a set of Horn clauses  *)
+(* For system S43: gamma * == {[]P | []P : gamma}                *)
+(*                 delta * == {<>P | <>P : delta}                *)
+
+  lstar0         "|L>"
+  lstar1         "$G |L> $H ==> []P, $G |L> []P, $H"
+  lstar2         "$G |L> $H ==>   P, $G |L>      $H"
+  rstar0         "|R>"
+  rstar1         "$G |R> $H ==> <>P, $G |R> <>P, $H"
+  rstar2         "$G |R> $H ==>   P, $G |R>      $H"
+
+(* Set of Horn clauses to generate the antecedents for the S43 pi rule       *)
+(* ie                                                                        *)
+(*           S1...Sk,Sk+1...Sk+m                                             *)
+(*     ----------------------------------                                    *)
+(*     <>P1...<>Pk, $G |- $H, []Q1...[]Qm                                    *)
+(*                                                                           *)
+(*  where Si == <>P1...<>Pi-1,<>Pi+1,..<>Pk,Pi, $G * |- $H *, []Q1...[]Qm    *)
+(*    and Sj == <>P1...<>Pk, $G * |- $H *, []Q1...[]Qj-1,[]Qj+1...[]Qm,Qj    *)
+(*    and 1<=i<=k and k<j<=k+m                                               *)
+
+  S43pi0         "S43pi $L;; $R;; $Lbox; $Rdia"
+  S43pi1
+   "[| (S43pi <>P,$L';     $L;; $R; $Lbox;$Rdia);   $L',P,$L,$Lbox |- $R,$Rdia |] ==> \
+\       S43pi     $L'; <>P,$L;; $R; $Lbox;$Rdia"
+  S43pi2
+   "[| (S43pi $L';; []P,$R';     $R; $Lbox;$Rdia);  $L',$Lbox |- $R',P,$R,$Rdia |] ==> \
+\       S43pi $L';;     $R'; []P,$R; $Lbox;$Rdia"
+
+(* Rules for [] and <> for S43 *)
+
+  boxL           "$E, P, $F, []P |- $G ==> $E, []P, $F |- $G"
+  diaR           "$E |- $F, P, $G, <>P ==> $E |- $F, <>P, $G"
+  pi1
+   "[| $L1,<>P,$L2 |L> $Lbox;  $L1,<>P,$L2 |R> $Ldia;  $R |L> $Rbox;  $R |R> $Rdia;  \
+\      S43pi ; $Ldia;; $Rbox; $Lbox; $Rdia |] ==> \
+\   $L1, <>P, $L2 |- $R"
+  pi2
+   "[| $L |L> $Lbox;  $L |R> $Ldia;  $R1,[]P,$R2 |L> $Rbox;  $R1,[]P,$R2 |R> $Rdia;  \
+\      S43pi ; $Ldia;; $Rbox; $Lbox; $Rdia |] ==> \
+\   $L |- $R1, []P, $R2"
+end
+
+ML
+
+local
+
+  val S43pi  = "S43pi";
+  val SS43pi = "@S43pi";
+
+  val tr  = LK.seq_tr1;
+  val tr' = LK.seq_tr1';
+
+  fun s43pi_tr[s1,s2,s3,s4,s5,s6]=
+	Const(S43pi,dummyT)$tr s1$tr s2$tr s3$tr s4$tr s5$tr s6;
+  fun s43pi_tr'[Abs(_,_,s1),Abs(_,_,s2),Abs(_,_,s3),
+		Abs(_,_,s4),Abs(_,_,s5),Abs(_,_,s6)] =
+        Const(SS43pi,dummyT)$tr' s1$tr' s2$tr' s3$tr' s4$tr' s5$tr' s6;
+in
+val parse_translation = [(SS43pi,s43pi_tr)];
+val print_translation = [(S43pi,s43pi_tr')]
+end