Mon, 22 Mar 2010 08:30:13 +0100 adding proof procedure for cases rule with tuples; adding introduction rule for negated premises; improving proof procedure with negated premises
bulwahn [Mon, 22 Mar 2010 08:30:13 +0100] rev 35884
adding proof procedure for cases rule with tuples; adding introduction rule for negated premises; improving proof procedure with negated premises
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