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More changes from >0 to ~=0::nat
2007-10-21, by nipkow
tuned
2007-10-21, by urbanc
further comments
2007-10-21, by urbanc
polished the proofs and added a version of the weakening lemma that does not use the variable convention
2007-10-21, by urbanc
fixed proof: neq0_conv;
2007-10-21, by wenzelm
modernized specifications ('definition', 'axiomatization');
2007-10-21, by wenzelm
Eliminated most of the neq0_conv occurrences. As a result, many
2007-10-21, by nipkow
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