Wed, 05 Dec 2001 15:44:45 +0100 wenzelm iff;
Wed, 05 Dec 2001 15:36:48 +0100 wenzelm updated;
Wed, 05 Dec 2001 15:36:36 +0100 wenzelm adapted intr/elim uses;
Wed, 05 Dec 2001 14:32:10 +0100 wenzelm eliminated old use of intro/elim method;
Wed, 05 Dec 2001 13:16:34 +0100 wenzelm simplified proof (no longer use swapped rules);
Wed, 05 Dec 2001 03:19:47 +0100 wenzelm fixed intro steps;
(0) -10000 -3000 -1000 -300 -100 -30 -10 -6 +6 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip