notational update in lambdadelta completed

[helm.git] / matita / matita / contribs / lambdadelta / ground_2 / etc / lib / list2_append.etc

diff --git a/matita/matita/contribs/lambdadelta/ground_2/etc/lib/list2_append.etc b/matita/matita/contribs/lambdadelta/ground_2/etc/lib/list2_append.etc
new file mode 100644 (file)
index 0000000..cf3b464
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/ground_2/etc/lib/list2_append.etc
@@ -0,0 +1,26 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||         The HELM team.                                      *)
+(*      ||A||         http://helm.cs.unibo.it                             *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU General Public License Version 2                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+include "ground_2/notation/functions/oplus_4.ma".
+include "ground_2/lib/list2.ma".
+
+(* LISTS OF PAIRS ***********************************************************)
+
+rec definition append2 A1 A2 (l1,l2:list2 A1 A2) on l1 ≝ match l1 with
+[ nil2           ⇒ l2
+| cons2 a1 a2 tl ⇒ {a1, a2} ⨮ append2 A1 A2 tl l2
+].
+
+interpretation "append (list of pairs)"
+   'OPlus A1 A2 l1 l2 = (append2 A1 A2 l1 l2).