Fri, 04 Jan 2008 09:34:11 +0100 urbanc adapted to new inversion rules
Fri, 04 Jan 2008 09:05:01 +0100 haftmann fixed typo
Fri, 04 Jan 2008 09:04:32 +0100 haftmann improved warning
Fri, 04 Jan 2008 00:54:12 +0100 huffman add new is_ub lemmas; clean up directed_finite proofs
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