--- a/src/HOL/Complete_Lattice.thy Thu Aug 04 07:31:59 2011 +0200
+++ b/src/HOL/Complete_Lattice.thy Thu Aug 04 07:33:08 2011 +0200
@@ -405,7 +405,7 @@
apply (simp_all add: inf_Sup sup_Inf)*)
subclass distrib_lattice proof -- {* Question: is it sufficient to include @{class distrib_lattice}
- and proof @{text inf_Sup} and @{text sup_Inf} from that? *}
+ and prove @{text inf_Sup} and @{text sup_Inf} from that? *}
fix a b c
from sup_Inf have "a \<squnion> \<Sqinter>{b, c} = (\<Sqinter>d\<in>{b, c}. a \<squnion> d)" .
then show "a \<squnion> b \<sqinter> c = (a \<squnion> b) \<sqinter> (a \<squnion> c)" by (simp add: INF_def Inf_binary)