Tue, 21 Feb 2012 23:25:36 +0100 wenzelm tuned proofs;
Tue, 21 Feb 2012 23:24:49 +0100 wenzelm more robust visible_range: allow empty view;
Tue, 21 Feb 2012 22:50:28 +0100 wenzelm misc tuning;
Tue, 21 Feb 2012 21:15:57 +0100 wenzelm merged;
Tue, 21 Feb 2012 20:43:58 +0100 wenzelm made SML/NJ happy;
Tue, 21 Feb 2012 20:22:23 +0100 wenzelm tuned proofs;
Tue, 21 Feb 2012 17:09:53 +0100 wenzelm merged
Tue, 21 Feb 2012 17:09:17 +0100 wenzelm tuned proofs;
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