1.1 --- a/src/HOL/Fun.thy	Tue Sep 07 15:56:33 2010 -0700
     1.2 +++ b/src/HOL/Fun.thy	Wed Sep 08 10:45:55 2010 +0200
     1.3 @@ -18,6 +18,8 @@
     1.4  apply (simp (no_asm_simp))
     1.5  done
     1.6  
     1.7 +lemmas expand_fun_eq = ext_iff
     1.8 +
     1.9  lemma apply_inverse:
    1.10    "f x = u \<Longrightarrow> (\<And>x. P x \<Longrightarrow> g (f x) = x) \<Longrightarrow> P x \<Longrightarrow> x = g u"
    1.11    by auto