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src/HOL/Library/Char_ord.thy
changeset 27682 25aceefd4786
parent 27368 9f90ac19e32b
child 28562 4e74209f113e 
--- a/src/HOL/Library/Char_ord.thy	Fri Jul 25 12:03:32 2008 +0200
+++ b/src/HOL/Library/Char_ord.thy	Fri Jul 25 12:03:34 2008 +0200
@@ -35,7 +35,7 @@
     by (auto simp add: nat_of_nibble_eq)
 next
   fix n m :: nibble
-  show "n < m \<longleftrightarrow> n \<le> m \<and> n \<noteq> m"
+  show "n < m \<longleftrightarrow> n \<le> m \<and> \<not> m \<le> n"
     unfolding nibble_less_eq_def nibble_less_def less_le
     by (auto simp add: nat_of_nibble_eq)
 next
isabelle