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2018-04-20 Ferruccio Guidinotational update in ground_2 and basic_2
2015-10-11 Ferruccio Guidiground_2 milestone: multiple relocation with lists...
2015-07-14 Ferruccio Guidi- subtraction (and related notions) removed
2015-03-25 Ferruccio Guidi- revision of ground_2 and basic_2
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
2013-11-27 Ferruccio Guidistrict order relation for natural numbers with inifinity
2013-11-26 Ferruccio Guidi- natural numbers with infinity for lambdadelta