Tue, 03 Apr 2012 08:55:06 +0200 nipkow made sure that " is shown in tutorial text
Mon, 02 Apr 2012 21:26:46 +0100 Christian Urban merged
Mon, 02 Apr 2012 21:26:07 +0100 Christian Urban tuned proofs
Mon, 02 Apr 2012 20:12:19 +0200 nipkow merged
Mon, 02 Apr 2012 20:12:10 +0200 nipkow towards showing " in the tutorial
Mon, 02 Apr 2012 18:12:53 +0100 Christian Urban tuned proof in order to avoid warning message
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