diff -r d122c24a93d6 -r a99a7cbf0fb5 src/HOL/Analysis/Arcwise_Connected.thy
--- a/src/HOL/Analysis/Arcwise_Connected.thy	Tue Oct 24 10:59:15 2017 +0200
+++ b/src/HOL/Analysis/Arcwise_Connected.thy	Tue Oct 24 18:48:21 2017 +0200
@@ -1093,7 +1093,8 @@
             proof
               have "real j < 2 ^ n"
                 using j_le i k
-                apply (auto simp: le_max_iff_disj simp del: real_of_nat_less_numeral_power_cancel_iff elim!: le_less_trans)
+                apply (auto simp: le_max_iff_disj simp del: of_nat_less_numeral_power_cancel_iff
+                    elim!: le_less_trans)
                  apply (auto simp: field_simps)
                 done
               then show "j < 2 ^ n"