diff -r 143f58bb34f9 -r 0909deb8059b src/HOL/Algebra/Divisibility.thy
--- a/src/HOL/Algebra/Divisibility.thy	Thu May 26 16:57:14 2016 +0200
+++ b/src/HOL/Algebra/Divisibility.thy	Thu May 26 17:51:22 2016 +0200
@@ -2340,7 +2340,7 @@
 qed
 
 
---"A version using @{const factors}, more complicated"
+\<comment>"A version using @{const factors}, more complicated"
 lemma (in factorial_monoid) factors_irreducible_is_prime:
   assumes pirr: "irreducible G p"
     and pcarr: "p \<in> carrier G"