Minor proof tuning.
--- a/src/HOL/Library/Kleene_Algebra.thy Sun May 23 13:00:01 2010 +0100
+++ b/src/HOL/Library/Kleene_Algebra.thy Sun May 23 14:56:58 2010 +0100
@@ -232,7 +232,7 @@
thus "x + star b * x * a \<le> x + star b * b * x"
using add_mono by auto
show "\<dots> \<le> star b * x"
- by (metis add_supremum left_distrib less_add mult.left_neutral mult_assoc mult_right_mono star_unfold_left star_unfold_right zero_minimum)
+ by (metis add_supremum left_distrib less_add mult.left_neutral mult_assoc mult_right_mono star_unfold_right zero_minimum)
qed
lemma star_simulation [simp]: