src/HOL/Isar_examples/MutilatedCheckerboard.thy
Fri, 03 Sep 1999 14:21:59 +0200 wenzelm from hyp;
Wed, 01 Sep 1999 21:35:39 +0200 wenzelm tuned;
Mon, 30 Aug 1999 11:13:27 +0200 wenzelm tuned;
less more (0) -3 tip