src/FOLP/ex/If.ML

--- a/src/FOLP/ex/If.ML	Sat Sep 17 20:49:14 2005 +0200
+++ b/src/FOLP/ex/If.ML	Sun Sep 18 14:25:48 2005 +0200
@@ -1,20 +1,15 @@
-(*  Title:      FOLP/ex/if
+(*  Title:      FOLP/ex/If.ML
     ID:         $Id$
     Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
     Copyright   1991  University of Cambridge
-
-For ex/if.thy.  First-Order Logic: the 'if' example
 *)
 
-open If;
-open Cla;    (*in case structure Int is open!*)
-
-val prems = goalw If.thy [if_def]
+val prems = goalw (the_context ()) [if_def]
     "[| !!x. x:P ==> f(x):Q; !!x. x:~P ==> g(x):R |] ==> ?p:if(P,Q,R)";
 by (fast_tac (FOLP_cs addIs prems) 1);
 val ifI = result();
 
-val major::prems = goalw If.thy [if_def]
+val major::prems = goalw (the_context ()) [if_def]
    "[| p:if(P,Q,R);  !!x y.[| x:P; y:Q |] ==> f(x,y):S; \
 \                    !!x y.[| x:~P; y:R |] ==> g(x,y):S |] ==> ?p:S";
 by (cut_facts_tac [major] 1);
@@ -39,5 +34,3 @@
 Goal "?p : if(if(P,Q,R), A, B) <-> if(P, if(Q,A,B), if(R,A,B))";
 by (fast_tac if_cs 1);
 val nested_ifs = result();
-
-writeln"Reached end of file.";