From: Ferruccio Guidi <ferruccio.guidi@unibo.it>
Date: Mon, 28 Dec 2020 18:43:58 +0000 (+0100)
Subject: arithmetics for λδ
X-Git-Tag: make_still_working~167
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=5e72e41f4f86814e56d4b00959ccc56c71042a4c;hp=5e72e41f4f86814e56d4b00959ccc56c71042a4c;p=helm.git

arithmetics for λδ

+ subtraction for non-negative integers
+ web site update
+ apps_2/examples: minor update
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