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src/HOL/Isar_Examples/Structured_Statements.thy
changeset 69597 ff784d5a5bfb
parent 63583 a39baba12732 
--- a/src/HOL/Isar_Examples/Structured_Statements.thy	Sat Jan 05 17:00:43 2019 +0100
+++ b/src/HOL/Isar_Examples/Structured_Statements.thy	Sat Jan 05 17:24:33 2019 +0100
@@ -152,9 +152,9 @@
 
   have C
   proof -
-    show ?thesis when "A x" (is ?A) for x :: 'a  \<comment> \<open>abstract @{term x}\<close>
+    show ?thesis when "A x" (is ?A) for x :: 'a  \<comment> \<open>abstract \<^term>\<open>x\<close>\<close>
       using that \<proof>
-    show "?A a"  \<comment> \<open>concrete @{term a}\<close>
+    show "?A a"  \<comment> \<open>concrete \<^term>\<open>a\<close>\<close>
       \<proof>
   qed
 end
isabelle