Sun, 14 Feb 2016 16:40:00 +0100 wenzelm more explicit dummy proofs;
Sun, 14 Feb 2016 16:39:43 +0100 wenzelm unused;
Sun, 14 Feb 2016 16:30:27 +0100 wenzelm command '\<proof>' is an alias for 'sorry', with different typesetting;
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