src/HOL/Isar_Examples/Basic_Logic.thy
Tue, 07 Oct 2014 20:59:46 +0200 wenzelm more cartouches;
Fri, 21 Feb 2014 18:23:11 +0100 wenzelm more symbols;
Thu, 20 Feb 2014 23:46:40 +0100 wenzelm tuned proofs;
less more (0) -3 tip