From: Ferruccio Guidi <fguidi@maelstrom.helm.cs.unibo.it>
Date: Wed, 9 May 2018 18:10:36 +0000 (+0200)
Subject: update in groud_2 and models
X-Git-Tag: make_still_working~327
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=e880d6eab5e1700f4a625ddcd7d0fa8f0cce2dcc;hp=e880d6eab5e1700f4a625ddcd7d0fa8f0cce2dcc;p=helm.git

update in groud_2 and models

+ denotation is preserved by r-transition
+ minor additions
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