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compile-time feature PROFV to profile validation without sort inclusion
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2015-03-25 Ferruccio Guidi- revision of ground_2 and basic_2
2014-02-21 Ferruccio Guidi- main proposition on lsx finally proved!
2014-01-09 Ferruccio Guidi- ynat: some additions
2014-01-03 Ferruccio Guidi- extended multiple substitutions now uses bounds in...
2014-01-03 Ferruccio Guidimore arithmetics for natural numbers with infinity ...
2013-12-28 Ferruccio Guidisome improvements and new lemmas for
2013-12-01 Ferruccio Guidi- improved arithmetics for natural numbers with infinity