Tue, 08 Dec 2009 22:02:14 +0100 Christian Urban proper formulation of all preservation theorems
Tue, 08 Dec 2009 20:55:55 +0100 Christian Urban started to reformulate preserve lemmas
Tue, 08 Dec 2009 20:34:00 +0100 Christian Urban properly set up the prs_rules
Tue, 08 Dec 2009 17:43:32 +0100 Christian Urban merged
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