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src/HOL/Library/Extended_Real.thy
changeset 56537 01caba82e1d2
parent 56536 aefb4a8da31f
child 56889 48a745e1bde7 
--- a/src/HOL/Library/Extended_Real.thy	Fri Apr 11 13:36:57 2014 +0200
+++ b/src/HOL/Library/Extended_Real.thy	Fri Apr 11 17:11:41 2014 +0200
@@ -536,7 +536,7 @@
 lemma incseq_ereal: "incseq f \<Longrightarrow> incseq (\<lambda>x. ereal (f x))"
   unfolding incseq_def by auto
 
-lemma ereal_add_nonneg_nonneg:
+lemma ereal_add_nonneg_nonneg[simp]:
   fixes a b :: ereal
   shows "0 \<le> a \<Longrightarrow> 0 \<le> b \<Longrightarrow> 0 \<le> a + b"
   using add_mono[of 0 a 0 b] by simp
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