Tue, 08 Dec 2009 22:05:01 +0100 Cezary Kaliszyk merge
Tue, 08 Dec 2009 22:03:34 +0100 Cezary Kaliszyk An example which is hard to lift because of the interplay between lambda_prs and unfolding.
Tue, 08 Dec 2009 22:02:14 +0100 Christian Urban proper formulation of all preservation theorems
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