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src/HOL/Groups.thy
changeset 36977 71c8973a604b
parent 36348 89c54f51f55a
child 37884 314a88278715 
--- a/src/HOL/Groups.thy	Mon May 17 18:51:25 2010 -0700
+++ b/src/HOL/Groups.thy	Mon May 17 18:59:59 2010 -0700
@@ -605,7 +605,7 @@
   then show ?thesis by simp
 qed
 
-lemma add_nonneg_nonneg:
+lemma add_nonneg_nonneg [simp]:
   assumes "0 \<le> a" and "0 \<le> b" shows "0 \<le> a + b"
 proof -
   have "0 + 0 \<le> a + b"
isabelle