src/HOL/List.thy

--- a/src/HOL/List.thy	Mon Nov 18 17:10:57 2013 +0100
+++ b/src/HOL/List.thy	Mon Nov 18 17:14:01 2013 +0100
@@ -2988,6 +2988,9 @@
 lemma map_Suc_upt: "map Suc [m..<n] = [Suc m..<Suc n]"
 by (induct n) auto
 
+lemma map_add_upt: "map (\<lambda>i. i + n) [0..<m] = [n..<m + n]"
+  by (induct m) simp_all
+
 lemma nth_map_upt: "i < n-m ==> (map f [m..<n]) ! i = f(m+i)"
 apply (induct n m  arbitrary: i rule: diff_induct)
 prefer 3 apply (subst map_Suc_upt[symmetric])