# HG changeset patch
# User paulson
# Date 1021452152 -7200
# Node ID 773657d466cba07acb70511cf4b2613d590c4dea
# Parent  fe118a977a6dd02a2b6b7ebcec9e2f4bace014fa
better simplification of trivial existential equalities

diff -r fe118a977a6d -r 773657d466cb src/FOL/simpdata.ML
--- a/src/FOL/simpdata.ML	Tue May 14 12:33:42 2002 +0200
+++ b/src/FOL/simpdata.ML	Wed May 15 10:42:32 2002 +0200
@@ -57,6 +57,7 @@
   "(ALL x. x=t --> P(x)) <-> P(t)",
   "(ALL x. t=x --> P(x)) <-> P(t)",
   "(EX x. P) <-> P",
+  "EX x. x=t", "EX x. t=x",
   "(EX x. x=t & P(x)) <-> P(t)",
   "(EX x. t=x & P(x)) <-> P(t)"]);
 
diff -r fe118a977a6d -r 773657d466cb src/ZF/AC.thy
--- a/src/ZF/AC.thy	Tue May 14 12:33:42 2002 +0200
+++ b/src/ZF/AC.thy	Wed May 15 10:42:32 2002 +0200
@@ -15,7 +15,7 @@
 (*The same as AC, but no premise a \<in> A*)
 lemma AC_Pi: "[| !!x. x \<in> A ==> (\<exists>y. y \<in> B(x)) |] ==> \<exists>z. z \<in> Pi(A,B)"
 apply (case_tac "A=0")
-apply (simp add: Pi_empty1, blast)
+apply (simp add: Pi_empty1)
 (*The non-trivial case*)
 apply (blast intro: AC)
 done
diff -r fe118a977a6d -r 773657d466cb src/ZF/Epsilon.ML
--- a/src/ZF/Epsilon.ML	Tue May 14 12:33:42 2002 +0200
+++ b/src/ZF/Epsilon.ML	Wed May 15 10:42:32 2002 +0200
@@ -314,7 +314,6 @@
 Goal "transrec2(succ(i),a,b) = b(i, transrec2(i,a,b))";
 by (rtac (transrec2_def RS def_transrec RS trans) 1);
 by (simp_tac (simpset() addsimps [the_equality, if_P]) 1);
-by (Blast_tac 1);
 qed "transrec2_succ";
 
 Goal "Limit(i) ==> transrec2(i,a,b) = (UN j<i. transrec2(j,a,b))";
diff -r fe118a977a6d -r 773657d466cb src/ZF/List.ML
--- a/src/ZF/List.ML	Tue May 14 12:33:42 2002 +0200
+++ b/src/ZF/List.ML	Wed May 15 10:42:32 2002 +0200
@@ -238,7 +238,6 @@
 \          ALL x.  EX z zs. drop(length(xs), Cons(x,xs)) = Cons(z,zs)";
 by (etac list.induct 1);
 by (ALLGOALS Asm_simp_tac);
-by (Blast_tac 1);
 qed_spec_mp "drop_length_Cons";
 
 Goal "l: list(A) ==> ALL i:length(l). (EX z zs. drop(i,l) = Cons(z,zs))";
diff -r fe118a977a6d -r 773657d466cb src/ZF/OrdQuant.thy
--- a/src/ZF/OrdQuant.thy	Tue May 14 12:33:42 2002 +0200
+++ b/src/ZF/OrdQuant.thy	Wed May 15 10:42:32 2002 +0200
@@ -84,7 +84,7 @@
 by (simp add: function_def lam_def) 
 
 lemma relation_lam: "relation (lam x:A. b(x))"  
-by (simp add: relation_def lam_def, blast) 
+by (simp add: relation_def lam_def) 
 
 lemma restrict_iff: "z \<in> restrict(r,A) \<longleftrightarrow> z \<in> r & (\<exists>x\<in>A. \<exists>y. z = \<langle>x, y\<rangle>)"
 by (simp add: restrict_def)