Tue, 28 Aug 2007 16:33:52 +0200 nipkow Commented out non-standard paragraph formatting.
Tue, 28 Aug 2007 15:34:15 +0200 nipkow added (code) lemmas for setsum and foldl
Tue, 28 Aug 2007 11:51:27 +0200 wenzelm replaced 'sorry' by unproven;
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