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src/HOL/Isar_examples/MutilatedCheckerboard.thy
changeset 9906 5c027cca6262
parent 9659 b9cf6801f3da
child 9941 fe05af7ec816 
--- a/src/HOL/Isar_examples/MutilatedCheckerboard.thy	Thu Sep 07 21:06:55 2000 +0200
+++ b/src/HOL/Isar_examples/MutilatedCheckerboard.thy	Thu Sep 07 21:10:11 2000 +0200
@@ -154,7 +154,7 @@
 
   have "?B (Suc m) = ?t Un ?B m"; by (simp add: Sigma_Suc);
   also; have "... : ?T";
-  proof (rule tiling_Un [rulify]);
+  proof (rule tiling_Un [rulified]);
     show "?t : ?T"; by (rule dominoes_tile_row);
     from hyp; show "?B m : ?T"; .;
     show "?t Int ?B m = {}"; by blast;
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