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some improvements and new lemmas for
[helm.git] / matita / matita / contribs / lambdadelta / ground_2 / ynat / ynat_lt.ma
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