2008-01-04 improved warning
haftmann [Fri, 04 Jan 2008 09:04:32 +0100] rev 25829
improved warning
2008-01-03 add new is_ub lemmas; clean up directed_finite proofs
huffman [Fri, 04 Jan 2008 00:54:12 +0100] rev 25828
add new is_ub lemmas; clean up directed_finite proofs
2008-01-03 new instance proofs for classes finite_po, chfin, flat
huffman [Fri, 04 Jan 2008 00:01:02 +0100] rev 25827
new instance proofs for classes finite_po, chfin, flat
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