Tue, 18 Mar 1997 10:42:08 +0100 paulson Stopped giving Introduction rules as Elimination rules
Tue, 18 Mar 1997 08:43:26 +0100 nipkow Added P&P&Q <-> P&Q and P|P|Q <-> P|Q
Tue, 18 Mar 1997 08:42:18 +0100 nipkow Added P&P&Q = P&Q and P|P|Q = P|Q.
Mon, 17 Mar 1997 15:38:26 +0100 nipkow *** empty log message ***
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