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src/HOL/Isar_examples/MutilatedCheckerboard.thy
changeset 16417 9bc16273c2d4
parent 13187 e5434b822a96
child 18153 a084aa91f701 
--- a/src/HOL/Isar_examples/MutilatedCheckerboard.thy	Fri Jun 17 11:35:35 2005 +0200
+++ b/src/HOL/Isar_examples/MutilatedCheckerboard.thy	Fri Jun 17 16:12:49 2005 +0200
@@ -6,7 +6,7 @@
 
 header {* The Mutilated Checker Board Problem *}
 
-theory MutilatedCheckerboard = Main:
+theory MutilatedCheckerboard imports Main begin
 
 text {*
  The Mutilated Checker Board Problem, formalized inductively.  See
isabelle